1
                                                                    EXHIBIT 10.3

                                                                 [DIALOGIC LOGO]
201-993-3000
201-993-3093 FAX

DIALOGIC CORPORATION
1515 Route Ten, Parsippany, New Jersey 07054


                       DIALOGIC VOLUME PURCHASE AGREEMENT

This Agreement is between Dialogic Corporation ("Dialogic"), headquartered at
1515 Route 10 East, Parsippany, New Jersey, and

Voicetek Corporation, located at 19 Alpha Road, Chelmsford, Massachusetts,
further known for the purposes of this Agreement as "Buyer".

The purpose of this Agreement is to afford Buyer the opportunity to obtain a
volume discount based on the total amount of purchases of certain products over
a one-year period. This Agreement is intended for use by Buyer if Buyer has
demonstrated the ability consistently to purchase products totaling at least 400
ports per year.

The parties hereby agree as follows:

Attachment #1 contains the pricing schedule for, and a list of the products that
may be covered by this Volume Purchase Agreement ("Products"). In order to take
advantage of a volume discount, Buyer must present Dialogic with a completed
Equipment Delivery Schedule (in the form provided by Dialogic, a copy of which
is attached) for each Product Buyer will purchase. Each completed Equipment
Delivery Schedule will represent Buyer's good faith forecast of the quantity of
each Product Buyer intends to purchase over the course of this Agreement.

In addition, Buyer will present to Dialogic, upon execution of this Agreement, a
written purchase order detailing exact quantities and ship dates for all
Products forecasted for shipment within the first three months of the Agreement.
Buyer will also issue to Dialogic, 30 days prior to the end of a quarter, a
written purchase order detailing the exact quantities and ship dates for all
Product forecasted for the subsequent quarter.

There is one Equipment Delivery Schedule included in this Agreement, all of
which taken together is Attachment #2 to this Agreement. * Voicetek agrees to
provide written statement of indirect sales, including customer and Dialogic
products sold, within 1 month after the end of each quarter.

This Agreement will be retroactive to the date of September 20, 1995.


   CONFIDENTIAL MATERIAL OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND
                EXCHANGE COMMISSION. ASTERISKS DENOTE OMISSIONS.

   2
Dialogic Volume Purchase Agreement, page 2


1. SALES CONDITIONS

All purchases of Products by Buyer from Dialogic shall reference this Agreement
and shall be governed by the terms and conditions of this Agreement
notwithstanding the presence of different or additional provisions on Buyer's
standard purchase order form.

Buyer represents that all purchases of Products under this Agreement are for end
use or for resale only when sold with Buyer's software or system. Buyer further
represents that Products purchased under this Agreement will not be sold
independently of software or systems except in the case of supplying spare
parts.

2. ORDERING AND TITLE



The Equipment Delivery Schedule(s) for each Product on Attachment #2 of this
Agreement represent Buyer's good faith forecast for the term of the Agreement.
UPON EXECUTION OF THE AGREEMENT BUYER IS REQUIRED TO FURNISH DIALOGIC WITH A
WRITTEN PURCHASE ORDER FOR PRODUCTS FORECASTED FOR SHIPMENT WITHIN THE FIRST 90
DAYS OF THIS AGREEMENT. Buyer shall also issue written purchase orders to
Dialogic, for the subsequent 90-day periods of this Agreement at least 30 days
prior to the start of that 90-day period. Dialogic will ship Products covered
by this Agreement in accordance with instructions on Buyer's written purchase
order. Changes to the written purchase order shall be made in accordance with
Section 6 of this Agreement. No Equipment Delivery Schedule or purchase order is
accepted until Dialogic issues a written confirmation thereof to Buyer.
Confirmation shall not be unreasonably withheld, but Dialogic reserves the right
to reject any Equipment Delivery Schedule with a growth rate of 5% or more per
month. All shipments by Dialogic are F.O.B. point of shipment by Dialogic. Title
to Products and risk of loss pass to Buyer upon delivery to carrier at shipping
point. Dialogic will select the carrier if Buyer does not.

Claims for shortages must be made within ten (10) days after arrival. In the
event of foreign delivery, Buyer shall be responsible for obtaining any and all
export licenses and other international trade documents required by United
States laws and all applicable laws of other jurisdictions and Buyer shall at
all times comply with all such laws regarding the Products.
   3
Dialogic Volume Purchase Agreement, page 3


3. TERM

The term of this Agreement shall commence on the first day of the earliest month
listed on Attachment #2 and continue for a term of 12 months.

4. PAYMENT TERMS AND CONDITIONS

Payment to Dialogic from Buyer for all Products shall be made in certified funds
prior to shipment of Products unless other payment terms are negotiated between
Buyer and Dialogic.

5. PRICING

The unit price Dialogic shall charge Buyer for the Products is calculated using
the Volume Price Schedule (Attachment #1), and all of the Equipment Delivery
Schedules for each Product. The sum of all the port totals for all the
Products specified on Attachment #2 shall determine, for the first 90 days of
this Agreement, the unit price, as shown on Attachment #1, for each Product.
Instructions for calculating the total number of ports are included on
Attachment #2.

6. SCHEDULE CHANGES

Buyer may cancel or reschedule any order for standard Products, provided written
notice is received by Dialogic 30 days before scheduled ship date. If 30-day
notice is not received by Dialogic, the following cancellation/reschedule
charges shall apply: A charge of 20% of the purchase price for the Product(s) in
the affected shipment will be applicable for cancellation/reschedule notices
received less than 14 days before the scheduled ship date, and a charge of 10%
will be applicable for notices received less than 30, but more than 14 days
before the scheduled ship date.

Products not scheduled in the original Attachment #2 may be added at any time
during the term of this Agreement, upon the following conditions: Buyer may be
required to amend Attachment #2 or one or more Equipment Delivery Schedule(s) to
include added Product if (a) Dialogic determines that the added Product
represents a large volume that is being shipped on a regular basis; or (b)
Dialogic determines that the quantity of added Product requested affects
Dialogic's ability to supply the Product; or (c) the total number of ports
specified in the original Attachment #2 plus the added Product quantity results
in a change in the price level. Equipment Delivery Schedules for added Product
are required only for the remainder of the term of this Agreement.
   4
Dialogic Volume Purchase Agreement, page 4


Other changes to the Equipment Delivery Schedules may result in changes in the
unit price of Products under the terms and conditions of Section 7 of this
Agreement.


7. MINIMUM PURCHASE REQUIREMENTS

Buyer is required to meet minimum quarterly purchase requirements in order to
maintain the volume pricing determined under Section 5. Table 1 lists these
quarterly minimum purchase requirements. The quarterly figures are cumulative.

          TABLE 1. Minimum Quarterly Port Purchase to Maintain Discount



                          By end of             Per cent of
                            quarter             total port commitment
                    -------------------------------------------------
                                             
                                 Q1              *
                                 Q2              *
                                 Q3              *


Progress toward the stated goal will be measured at the end of each quarter (90
days; 180 days; and 270 days from the effective date of this Agreement).

If, at any measuring point, Buyer has not achieved the minimum quarterly
purchase requirement, subsequent shipments will be priced at the level shown in
Attachment #1 that reflects actual shipment history. Notification of any pricing
change, if applicable, will occur within seven (7) days of each measuring point.

If actual purchases of Products by Buyer during any one quarter result in a
price increase of more than one level, as shown in Attachment #1, this Agreement
will be void and of no further effect and Buyer shall not be entitled to any
subsequent volume discount.

Buyer may achieve a greater discount if, at any measuring point, Buyer has
purchased sufficient ports to meet the minimum purchase requirements for a lower
price shown on Attachment #1.

In order to obtain this higher discount, Buyer must present to Dialogic one or
more amended Equipment Delivery Schedule(s) covering the balance of the term of
this Agreement. The total number of ports outlined in the amended Equipment
Delivery Schedule(s), added to the total number of ports already purchased by
Buyer, must equal the number of ports required for the lower price.

     CONFIDENTIAL MATERIAL OMITTED AND FILED SEPARATELY WITH THE SECURITIES
              AND EXCHANGE COMMISSION. ASTERISKS DENOTE OMISSIONS.
   5
Dialogic Volume Purchase Agreement, page 5


8. WARRANTY

Products purchased under this Agreement are subject to all the terms and
conditions set forth in the Limited Warranty published in the documentation for
the individual Products.

9. PATENTS AND COPYRIGHTS

Neither this Agreement nor the sale of any Product or part thereof by Dialogic
in accordance with this Agreement confers upon Buyer any license or other right
under any patent, trademark, copyright or other intellectual property right
pertaining to that Product.

Dialogic computer programs and documentation therefore are patented or are
copyrighted or both, and all rights are reserved by Dialogic Corporation. No
Dialogic Product or documentation may, in whole or in part, be copied,
photocopied, translated, or reduced to any electronic medium without the express
prior written permission of Dialogic Corporation.


10. LIABILITY

Dialogic shall not be liable for any costs or damages, and Buyer will indemnify,
defend, and hold Dialogic harmless from any expenses, damages, costs, or losses
resulting from any suit or proceeding based upon a claim arising from (a) a
modification of any Product by a party other than Dialogic after delivery by
Dialogic; or (b) compliance with Buyer's designs, specifications, or
instructions; or (c) the use of any Product or part thereof furnished hereunder
with any other product.

11. CONTINGENCIES

Dialogic shall not be responsible for any failure to perform under this
Agreement due to unforeseen circumstances or causes beyond Dialogic's reasonable
control. Dialogic may defer delivery for a period equal to the delay caused by
such an unforeseen or uncontrollable contingency.
   6
Dialogic Volume Purchase Agreement, page 6


12. MODIFICATION AND JURISDICTION

This Agreement sets forth the entire understanding of the parties and supersedes
all prior agreements and understandings relating to the subject matter hereof. 
No modifications or additions to or deletions from these terms shall be binding
upon either party unless accepted in writing by an authorized representative of
each party. Buyer shall not delegate any obligations hereunder nor assign any
interest or rights without prior written consent of Dialogic. This Agreement
shall be governed by the laws of the State of New Jersey, and this Agreement
shall be deemed to have been entered into and wholly performed in New Jersey.





BUYER'S SHIPPING ADDRESS:

Company Name: Voicetek Corporation
              ------------------------------------------------------------------
Street: 19 Alpha Road
        ------------------------------------------------------------------------
City: Chelmsford    St: MA        Zip: 01824-4175
      ----------        --             ----------


BILLING ADDRESS:

Company Name: Same as Above
              ------------------------------------------------------------------
Address
        ------------------------------------------------------------------------
City                                    St.                 Zip
     ----------------------------------     ---------------     ----------------

PURCHASING CONTACT:

Name: Michael Stahl           Title: Operations Manager
      -------------                  ------------------
Telephone (508) 250-7949      Ext.
          --------------           --------------------

FOR DIALOGIC CORPORATION:                  FOR BUYER:
   7
Dialogic Volume Purchase Agreement, page 7


Signed: /s/ Michael Stahl                    Signed: /s/  
        ---------------------------------            ---------------------------
Name: Michael Stahl                          Name:
      -----------------------------------          -----------------------------
Title: Manager of Operations                 Title:
       ----------------------------------           ----------------------------
Date: 11-3-95                            Date: 10/14/95
      -----------------------------------      ---------------------------------
   8
                           Attachment #2
                           -------------
                           Equipment Delivery Schedule

*

     CONFIDENTIAL MATERIAL OMITTED AND FILED SEPARATELY WITH THE SECURITIES
              AND EXCHANGE COMMISSION. ASTERISKS DENOTE OMISSIONS.

   9
                                  ATTACHMENT 1:
                                  -------------
                        Dialogic Volume Pricing Schedule




Product                                               Ports    **Note    15000 Port Price
=========================================================================================
                                                                
ISA VOICE PRODUCTS W/ ON BOARD TELEPHONE INTERFACE

Quickstart Development Platform                                                       *
D/240SC-T1                                             24.0                           *
D/160SC-LS                                             16.0                           *  
D/300SC-E1                                             30.0                           *  
D/320SC+DTI/212 pkg                                    30.0                           *  
D/21D                                                   2.0                           *  
D/41D                                                   4.0                           *   
D/41E                                                   4.0                           *   
D/41ESC                                                 4.0                           *  
D/42-NS                                                 4.0                           *  
D/42-SL                                                 4.0                           *  
D/41D Starter Kit                                       4.0                           *  
D/41E Starter Kit                                       4.0                           *  


ISA TELEPHONE NETWORK INTERFACES

DTI/240SC **New Product**                              12.0    A                      *  
DTI/241SC **New Product**                              16.0    A                      *  
DTI/300SC **New Product**                              15.0    A                      *  
DTI/301SC **New Product**                              20.0    A                      *  
LSI/161SC **New Product**                               8.0    A                      *  
LSI/81SC  **New Product**                               4.0    A                      *  
DID/120                                                12.0                           *  
DID/120-PM                                              2.0                           *  
DTI/124                                                12.0                           *  
DTI/211                                                12.0                           *  
LSI/120                                                 6.0                           *  


ISA SHARABLE VOICE RESOURCES

D/121B                                                  6.0                           *  
D/240SC                                                12.0                           *  
D/320SC                                                16.0                           *  
D/81A                                                   4.0                           *  
D/160SC **New Product**                                 8.0    A                      *  
D/80SC **New Product**                                  4.0    A                      *  


**Note:  A: Call your Dialogic Sales Representative for further details
         C: Additional price discounts available, please contact your Dialogic
            Sales Representative for more details
         Z: First copy at no additional cost with the purchase of Dialogic
            hardware

All PRICES ARE IN US $, FOR STANDARD BOARDS, FOB PARSIPPANY. SHIPPING AND
HANDLING NOT INCLUDED. PRICES SUBJECT TO CHANGE WITHOUT NOTICE.

Dialogic Corporation: July 1995


                    CONFIDENTIAL MATERIAL OMITTED AND FILED
                  SEPARATELY WITH THE SECURITIES AND EXCHANGE
                    COMMISSION. ASTERISKS DENOTE OMISSIONS.
                                                                          Page 1
   10
                                  ATTACHMENT 1:
                                  -------------
                        Dialogic Volume Pricing Schedule




Product                       Ports    **Note    15000 Port Price
=================================================================
                                        
ISA SWITCHING COMPONENTS

MSI/160SC - Preliminary        16.0                        *
MSI/240SC - Preliminary        24.0                        *
MSI/80SC - Preliminary          8.0                        *
SI/80 - Preliminary             8.0                        *
AMX/81                          2.0                        *
DMX                             4.0                        *
MSI Baseboard                  12.0                        *
MSI Power Module                                           *
MSI Station Interface           2.0                        *
SA/240 Station Adapter                                     *
AMX ESD Assy                                               *


VME VOICE PRODUCTS

V/S24T1 - Preliminary          24.0                        *
V/S30E1 - Preliminary          30.0                        *


OPEN DSP PLATFORMS

Antares DOS Software            6.0                        *
Antares SDK                    80.0                        *
Antares/2000x33                12.0                        *
Lernout & Hauspie ASR           0.5                        *
Lernout & Hauspie TTS           0.5                        *
Spox Debugger                  20.0                        *
Spox Kernel                    40.0                        *


ISA COMPLEMENTARY PRODUCTS

D/41E-IDPD                      8.0                        *
FAX/120                        12.0                        *
TTS/20                          8.0                        *
TTS/40                         16.0                        *
TTS/80                         24.0                        *
VR/40                          12.0                        *
VRP                             8.0                        *
VRM/40                          4.0                        *
VR/40p                         12.0                        *


**Note: A: Call your Dialogic Sales Representative for further details
        C: Additional price discounts available, please contact your Dialogic
           Sales Representative for more details
        Z: First copy at no additional cost with the purchase of Dialogic
           hardware

ALL PRICES ARE IN US $, FOR STANDARD BOARDS, FOB PARSIPPANY. SHIPPING AND
HANDLING NOT INCLUDED. PRICES SUBJECT TO CHANGE WITHOUT NOTICE.

Dialogic Corporation: July 1995

                    CONFIDENTIAL MATERIAL OMITTED AND FILED
                  SEPARATELY WITH THE SECURITIES AND EXCHANGE
                    COMMISSION. ASTERISKS DENOTE OMISSIONS.

                                                                          Page 2
   11
                                  ATTACHMENT 1:
                                  -------------
                        Dialogic Volume Pricing Schedule




Product                              Ports    **Note    15000 Port Price
========================================================================
                                               
VR/80p                                16.0                        *
VR/120p                               20.0                        *
VR/160p                               24.0                        *
VRM2C                                  4.0                        *
VFX/40SC                               8.0                        *
VFX40ESC                               8.0                        *


MICRO CHANNEL PRODUCTS

D/81-MC                                4.0                        *
LSI/80-MC                              4.0                        *
TTS/40-MC                              4.0                        *
TTS/80-MC                              8.0                        *
VR/81-MC                              16.0                        *


ENHANCED PLATFORMS

DTP 486/33-AC                         12.0    C                   *
DTP 486DX2/66-AC                      12.0    C                   *
DTP Pentium 90-AC                     12.0    C                   *
DTP 486/33-DC                         12.0    C                   *
DTP 486DX2/66-DC                      12.0    C                   *
DTP Pentium 90-DC                     12.0    C                   *
DTP/FR 486/33-AC                      12.0    C                   *
DTP/FR 486DX2/66-AC                   12.0    C                   *
DTP/FR Pentium 90-AC                  12.0    C                   *
DTP/FR 486/33-DC                      12.0    C                   *
DTP/FR 486DX2/66-DC                   12.0    C                   *
DTP/FR Pentium 90-DC                  12.0    C                   *
i486 256k cache upgrade


OPEN DEVELOPMENT PROGRAM

AEB Interface Development Package                                 *
PEB Interface Development Package                                 *
SCSA Spec Updates Service                                         *
SC2000 Development Kit                                            *
SC2000 chip only                                                  *
                                                                

**Note: A: Call your Dialogic Sales Representative for further details
        C: Additional price discounts available, please contact your Dialogic
           Sales Representative for more details
        Z: First copy at no additional cost with the purchase of Dialogic
           hardware

ALL PRICES ARE IN US $, FOR STANDARD BOARDS, FOB PARSIPPANY. SHIPPING AND
HANDLING NOT INCLUDED. PRICES SUBJECT TO CHANGE WITHOUT NOTICE.

Dialogic Corporation: July 1995



                                                                          Page 3

                    CONFIDENTIAL MATERIAL OMITTED AND FILED
                  SEPARATELY WITH THE SECURITIES AND EXCHANGE
                    COMMISSION. ASTERISKS DENOTE OMISSIONS.
   12
                                  ATTACHMENT 1:
                                  -------------
                        Dialogic Volume Pricing Schedule




Product                                             Ports    **Note    15000 Port Price
=======================================================================================
                                                              
SYSTEMS SOFTWARE

Dos Voice Driver                                             Z
OS/2 Voice Driver                                                                $  *
Unix Voice Driver                                                                $  *
App Server Lite                                       4.0                        $  *
App Server Plus                                       8.0                        $  *
AIX Voice Driver                                                                 $  *
Win NT Voice Driver                                                              $  *
Solaris Voice Driver                                                             $  *
Extra Driver Packages                                                            $  *
Extra Documentation Packages                                                     $  *


CT - DIVISION SOFTWARE PRODUCTS

CT Connect V1.0 Full System                                  C                   $  *
CT Connect V1.0 Full System Maintenance                      C                   $  *
CT Connect V1.0 Desk Top System                              C                   $  *
CT Connect V1.0 Desk Top System Maintenance                  C                   $  *
CT Connect V1.0 Desk Top Lite System                         C                   $  *
CT Connect V1.0 Desk Top Lite System Maintenance             C                   $  *
CT Connect Documentation Set                                                     $  *
CT Site Implementation Services                                                  $  *


TOOLS/UTILITIES

AC/101 Audio Coupler                                                             $  *
AIA/2 Audio Interface Adapter                                                    $  *
DID/120 Station Adapter                                                          $  *
SA/120 Station Adapter (LSI/120)                                                 $  *
SA/102 Station Adapter (AMX/81)                                                  $  *
PHED (Phase Editor for Unix)                          1.0                        $  *
VFEdit (Windows Prompt Editor)                        1.0                        $  *
VBASE/40 (DOS Prompt Editor)                                                     $  *
Promptmaster (Audio Coupler)                          1.0                        $  *
Voice Editing Toolkit                                                            $  *


ISA INTERNATIONAL PRODUCTS

D/21D-AN                                              2.0                        $  *


**NOTE:  A: Call your Dialogic Sales Representative for further details
         C: Additional price discounts available, please contact your Dialogic
            Sales Representative for more details
         Z: First copy at no additional cost with the purchase of Dialogic
            hardware

ALL PRICES ARE IN US $, FOR STANDARD BOARDS, FOB PARSIPPANY. SHIPPING AND
HANDLING NOT INCLUDED. PRICES SUBJECT TO CHANGE WITHOUT NOTICE.

Dialogic Corporation: July 1995


                                                                          Page 4

   CONFIDENTIAL MATERIAL OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND
                EXCHANGE COMMISSION. ASTERISKS DENOTE OMISSIONS
   13
                                  ATTACHMENT 1:
                                  -------------
                        Dialogic Volume Pricing Schedule




Product        Ports    **Note    15000 Port Price
==================================================
                         
D/21D-JP         2.0                           *
D/21D-SG         2.0                           *
D/21E-CH         2.0                           *
D/21E-DE         2.0                           *
D/21E-DK         2.0                           *
D/21E-FR         2.0                           *
D/21E-NL         2.0                           *
D/21E-SE         2.0                           *
D/21E-UK         2.0                           *
D/41D-AN         4.0                           *
D/41D-CY         4.0                           *
D/41D-CZ         4.0                           *
D/41D-DK         4.0                           *
D/41D-ES         4.0                           *
D/41D-HK         4.0                           *
D/41D-HU         4.0                           *
D/41D-IL         4.0                           *
D/41D-IT         4.0                           *
D/41D-JP         4.0                           *
D/41D-KR         4.0                           *
D/41D-MA         4.0                           *
D/41D-NO         4.0                           *
D/41D-PT         4.0                           *
D/41D-SE         4.0                           *
D/41D-TR         4.0                           *
D/41E-AN         4.0                           *
D/41E-AT         4.0                           *
D/41E-BE         4.0                           *
D/41E-CH         4.0                           *
D/41E-DE         4.0                           *
D/41E-FI         4.0                           *
D/41E-FR         4.0                           *
D/41E-JP         4.0                           *
D/41E-LU         4.0                           *
D/41E-NL         4.0                           *
D/41E-NO         4.0                           *
D/41E-PO         4.0                           *
D/41E-SE         4.0                           *
D/41E-SG         4.0                           *
D/41E-UK         4.0                           *
D/41ESC-AT       4.0                           *
D/41ESC-DEN      4.0                           *
D/41ESC-ES       4.0                           *
D/41ESC-FI       4.0                           *


**NOTE: A. Call your Dialogic Sales Representative for further details
        C: Additional price discounts available, please contact your Dialogic
           Sales Representative for more details
        Z: First copy at no additional cost with the purchase of Dialogic
           hardware

ALL PRICES ARE IN US , FOR STANDARD BOARDS, FOB PARSIPPANY. SHIPPING AND
HANDLING NOT INCLUDED. PRICES SUBJECT TO CHANGE WITHOUT NOTICE.

Dialogic Corporation: July 1995


                    CONFIDENTIAL MATERIAL OMITTED AND FILED
                  SEPARATELY WITH THE SECURITIES AND EXCHANGE
                    COMMISSION. ASTERISKS DENOTE OMISSIONS.

                                        Page 5
   14
                                  ATTACHMENT 1:
                                  -------------
                         Dialogic Volume Pricing Schedule



Product          Ports        **Note    15000 Port Price
=======================================================
                                       
D/41ESC-IT         4.0                              *
D/41ESC-LUX        4.0                              *
D/41ESC-NO         4.0                              *
D/41ESC-MY         4.0                              *
D/41ESC-PO         4.0                              *
D/41ESC-SG         4.0                              *
DID/120-HK        12.0                              *
DPD/120-JP        12.0                              *
DTI/212           15.0                              *
DTI/212-AN        15.0                              *
DTI/212-AT        15.0                              *
DTI/212-AU        15.0                              *
DTI/212-BE        15.0                              *
DTI/212-CZ        15.0                              *
DTI/212-ES        15.0                              *
DTI/212-FI        15.0                              *
DTI/212-HU        15.0                              *
DTI/212-IL        15.0                              *
DTI/212-IT        15.0                              *
DTI/212-LU        15.0                              *
DTI/212-NL        15.0                              *
DTI/212-NO        15.0                              *
DTI/212-SE        15.0                              *
DTI/212-TK        15.0                              *
DTI/212-UK        15.0                              *
D/300SC-E1-AN     30.0                              *
FM/80              1.0                              *
LSI/120-ES         6.0                              *
LSI/120-HK         6.0                              *
LSI/120-JP         6.0                              *
LSI/80-AT          4.0                              *
LSI/80-AU          4.0                              *
LSI/80-BE          4.0                              *
LSI/80-CH          4.0                              *
LSI/80-DE          4.0                              *
LSI/80-FI          4.0                              *
LSI/80-IT          4.0                              *
LSI/80-LU          4.0                              *
LSI/80-NL          4.0                              *
LSI/80-UK          4.0                              *
PRI/212-DE        15.0                              *
PRI/212-NL        15.0                              *


**NOTE: A: Call your Dialogic Sales Representative for further details
        C: Additional price discounts available, please contact your Dialogic
           Sales Representative for more details
        Z: First copy at no additional cost with the purchase of Dialogic
           hardware

ALL PRICES ARE IN US $, FOR STANDARD BOARDS, FOB PARSIPPANY. SHIPPING AND
HANDLING NOT INCLUDED. PRICES SUBJECT TO CHANGE WITHOUT NOTICE.

Dialogic Corporation: July 1995


CONFIDENTIAL MATERIAL OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND 
EXCHANGE COMMISSION. ASTERISKS DENOTE OMISSIONS.


                                                                          Page 6
   15
                                  ATTACHMENT 1:
                                  -------------
                        Dialogic Volume Pricing Schedule



Product                          Ports    **Note    15000 Port Price
====================================================================
                                                    
GAMMAFAX SINGLE LINE HARDWARE

CPI                                2.0                          *
CPi/100 *New Product*              2.0                          *
XPI                                1.0                          *
CPIMC                              2.0                          *
CPD                                2.0                          *
CP                                 2.0                          *
XP                                 1.0                          *
CP MC                              2.0                          *


GAMMAFAX MULTI-LINE HARDWARE

CP-4/AEB (14.4)                    8.0                          *
CP4/LSI                            8.0                          *
CP-4/MVIP                          8.0                          *
CP-4/MVIP/E                        8.0                          *
ML-MVIP (Daughterboard)            0.0                          *
ML-MVIP/E (Daughterboard)          0.0                          *
CP4/SC                             8.0                          *
CP-6/SC                           12.0                          *
CP-12/SC                          24.0                          *
CP-12/SC Daughterboard            12.0                          *


GAMMAFAX SOFTWARE

Gammapage                          0.0                          *
GPI for MS-DOS, 5.1                0.0                          *
GPI for MS-DOS, 5.0                0.0                          *
GPI for MS-DOS, 4.5                0.0                          *
GPI for OS/2, 5.1                  0.0                          *
GPI for OS/2, 5.0                  0.0                          *
GPI for OS/2, 4.5                  0.0                          *
GDK for SCO Unix                   0.0                          *
GDK for Interactive Unix           0.0                          *
GDK for UnixWare                   0.0                          *


GAMMAFAX UPGRADES

Hardware and Software upgrade      0.0                          *


**NOTE:  A: Call your Dialogic Sales Representative for further details
         C: Additional price discounts available, please contact your Dialogic
            Sales Representative for more details
         Z: First copy at no additional cost with the purchase of Dialogic
            hardware

ALL PRICES ARE IN US $, FOR STANDARD BOARDS, FOB PARSIPPANY. SHIPPING AND
HANDLING NOT INCLUDED. PRICES SUBJECT TO CHANGE WITHOUT NOTICE.

Dialogic Corporation: July 1995


                    CONFIDENTIAL MATERIAL OMITTED AND FILED
                  SEPARATELY WITH THE SECURITIES AND EXCHANGE
                    COMMISSION. ASTERISKS DENOTES OMISSIONS

                                                                          Page 7
   16
                                  ATTACHMENT 1:
                                  -------------
                        Dialogic Volume Pricing Schedule



Product                            Ports    **Note    15000 Port Price
======================================================================
                                             
CP GFax SW & Manuals DOS 5.2         0.0                         *
Gammapage upgrade 5.2                0.0                         *
GPF for MS-DOS, 5.2                  0.0                         *
GPI upgrade for MS-DOS, 5.0          0.0                         *
GPI upgrade for MS-DOS, 4.5          0.0                         *
GPI upgrade for OS/2, 5.1            0.0                         *
GPI upgrade for OS/2, 5.0            0.0                         *
GPI upgrade for OS/2, 4.5            0.0                         *
GFax SW & Manuals OS/2 5.1           0.0                         *


GAMMAFAX SPECIAL VARIATIONS

CPI - KDK                            2.0                         *
CP - KDK                             2.0                         *
CPI Canon                            2.0                         *
RFAX/4000                            4.0                         *
CPI bundle for Optus FACSYS          2.0                         *
XPI bundle for Optus FACSYS          1.0                         *
CPI bundle for Rightfax              2.0                         *
XPI bundle for Rightfax              1.0                         *
CPI bundle for Alcom                 2.0                         *
XPI bundle for Alcom                 1.0                         *
                                                                 
                                                                 
GAMMAFAX INTERNATIONAL VERSIONS

CPI-AU                               2.0                         *
XPI-AU                               1.0                         *
CP-AU                                2.0                         *
XP-AU                                1.0                         *
CP MC-AU                             2.0                         *
CPI-AU (w/ PTT label)                2.0                         *
XPI-AU (w/ PTT label)                1.0                         *
CP-AU (w/ PTT label)                 2.0                         *
XP-AU (w/ PTT label)                 1.0                         *
CP MC-AU (w/ PTT label)              2.0                         *
CP-AT                                2.0                         *
XP-AT                                1.0                         *
CPMC-AT                              2.0                         *
CP-AT (w/ PTT label)                 2.0                         *
XP-AT (w/ PTT label)                 1.0                         *
CPMC-AT (w/ PTT label)               2.0                         *


**NOTE:  A: Call your Dialogic Sales Representative for further details
         C: Additional price discounts available, please contact your Dialogic
            Sales Representative for more details
         Z: First copy at no additional cost with the purchase of Dialogic
            hardware

ALL PRICES ARE IN US $, FOR STANDARD BOARDS, FOB PARSIPPANY. SHIPPING AND
HANDLING NOT INCLUDED. PRICES SUBJECT TO CHANGE WITHOUT NOTICE.


Dialogic Corporation: July 1995



                                                                          Page 8

                    CONFIDENTIAL MATERIAL OMITTED AND FILED
                  SEPARATELY WITH THE SECURITIES AND EXCHANGE
                    COMMISSION. ASTERISKS DENOTE OMISSIONS.
   17
                                  ATTACHMENT 1:
                        Dialogic Volume Pricing Schedule



Product                     Ports    **Note    15000 Port Price
===============================================================
                                      
CPI-BH                        2.0                         *
CP-BE                         2.0                         *
XP-BE                         1.0                         *
CP MC-BE                      2.0                         *
CPI-CA                        2.0                         *
XPI-CA                        1.0                         *
CPI MC-CA                     2.0                         *
CPD-CA                        2.0                         *
CP4/LSI-CA                    8.0                         *
CP-CS                         2.0                         *
XP-CS                         1.0                         *
CP-DK                         2.0                         *
XP-DK                         1.0                         *
CP MC-DK                      2.0                         *
CP-DK (w/ PTT label)          2.0                         *
XP-DK (w/ PTT label)          1.0                         *
CP MC-DK (w/ PTT label)       2.0                         *
CP-FI                         2.0                         *
XP-FI                         1.0                         *
CP-FR                         2.0                         *
XP-FR                         2.0
CPI-FR                        2.0                         *
CP-DE                         2.0                         *
XP-DE                         1.0                         *
CPI-GB                        2.0                         *
XPI-GB                        1.0                         *
CP-HK                         2.0                         *
XP-HK                         1.0                         *
CP MC-HK                      2.0                         *
CP-HU                         2.0                         *
XP-HU                         1.0                         *
CP-IS                         2.0                         *
XP-IS                         1.0                         *
CP-IN                         2.0                         *
XP-IN                         1.0                         *
CP-IL                         2.0                         *
CPI-IT                        2.0                         *
XPI-IT                        1.0                         *
CP-IT                         2.0                         *
XP-IT                         1.0                         *
CP MC-IT                      2.0                         *
CP-IT (w/ PTT label)          2.0                         *
XP-IT (w/ PTT label)          1.0                         *
CP MC-IT (w/ PTT label)       2.0                         *


**NOTE: A: Call your Dialogic Sales Representative for further details
        C: Additional price discounts available, please contact your Dialogic
           Sales Representative for more details
        Z: First copy at no additional cost with the purchase of Dialogic
           hardware

ALL PRICES ARE IN US $, FOR STANDARD BOARDS, FOB PARSIPPANY. SHIPPING AND
HANDLING NOT INCLUDED. PRICES SUBJECT TO CHANGE WITHOUT NOTICE.

Dialogic Corporation: July 1995


                    CONFIDENTIAL MATERIAL OMITTED AND FILED
                  SEPARATELY WITH THE SECURITIES AND EXCHANGE
                    COMMISSION. ASTERISKS DENOTES OMISSIONS


                                                                          Page 9
   18
                                  ATTACHMENT 1:
                                  -------------
                        Dialogic Volume Pricing Schedule



Product                       Ports    **Note    15000 Port Price
=================================================================
                                        
CP-JP                           2.0                          *
XP-JP                           1.0                          *
CP-JP (w/ PTT label)            2.0                          *
XP-JP (w/ PTT label)            1.0                          *
CPI-KO                          2.0                          *
XPI-KO                          1.0                          *
CP-LU                           2.0                          *
XP-LU                           1.0                          *
CP MC-LU                        2.0                          *
CP-MY                           2.0                          *
XP-MY                           1.0                          *
CP MC-MY                        2.0                          *
CP-MX                           2.0                          *
XP-MX                           1.0                          *
CP-NL                           2.0                          *
XP-NL                           1.0                          *
CP MC-NL                        2.0                          *
CP-NL (w/ PTT label)            2.0                          *
XP-NL (w/ PTT label)            1.0                          *
CP-NL (w/ PTT label)            2.0                          *
CPI-NZ                          2.0                          *
XPI-NZ                          1.0                          *
CP MC-NZ                        2.0                          *
CPI-NZ (w/ PTT label)           2.0                          *
XPI-NZ (w/ PTT label)           1.0                          *
CP MC-NZ(w/ PTT label)          2.0                          *
CP-NO                           2.0                          *
XP-NO                           1.0                          *
CP-NO (w/ PTT label)            2.0                          *
XP-NO (w/ PTT label)            1.0                          *
CP-SG                           2.0                          *
XP-SG                           1.0                          *
CPI-ZA                          2.0                          *
XPI-ZA                          1.0                          *
CP-ES                           2.0                          *
XP-ES                           1.0                          *
CPISE                           2.0                          *
XPI-SE                          1.0                          *
CP-TH                           2.0                          *
XP-TH                           1.0                          *
CPI-Non USA and Canada          2.0                          *
XPI Non USA and Canada          1.0                          *
CPIMC-Non USA and Canada        2.0                          *
CPMC-Non USA and Canada         2.0                          *


**NOTE: A: Call your Dialogic Sales Representative for further details
        C: Additional price discounts available, please contact your Dialogic
           Sales Representative for more details
        Z: First copy at no additional cost with the purchase of Dialogic
           hardware

ALL PRICES ARE IN US $, FOR STANDARD BOARDS, FOB PARSIPPANY. SHIPPING AND
HANDLING NOT INCLUDED. PRICES SUBJECT TO CHANGE WITHOUT NOTICE.

Dialogic Corporation: July 1995



                                                                         Page 10


CONFIDENTIAL MATERIAL OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND
EXCHANGE COMMISSION. ASTERISKS DENOTE OMISSIONS.
   19
                                  ATTACHMENT 1:
                                  -------------
                        Dialogic Volume Pricing Schedule



Product                  Ports    **Note    15000 Port Price
============================================================
                                   
CP Non USA and Canada      2.0                          *
XP Non USA and Canada      1.0                          *


**NOTE: A: Call your Dialogic Sales Representative for further details
        C: Additional price discounts available, please contact your Dialogic
           Sales Representative for more details
        Z: First copy at no additional cost with the purchase of Dialogic
           hardware

ALL PRICES ARE IN US $, FOR STANDARD BOARDS, FOB PARSIPPANY. SHIPPING AND
HANDLING NOT INCLUDED. PRICES SUBJECT TO CHANGE WITHOUT NOTICE.

Dialogic Corporation: July 1995



                                                                         Page 11


CONFIDENTIAL MATERIAL OMITTED AND FILED SEPARATELY WITH THE SECURITIES AND
EXCHANGE COMMISSION. ASTERISKS DENOTE OMISSIONS.