EXHIBIT 10.5

                          COLLATERAL PLEDGE AGREEMENT

     This Collateral Pledge Agreement (the "Agreement") is made this 2nd day 
of February, 1998, by CTI Group (Holdings), Inc., a Delaware corporation 
("Pledgor'), in favor of Siemens plc, an English company ("Pledgee"). 

                                  BACKGROUND

     Pursuant to a certain Asset Purchase Agreement of even date herewith 
between CTI Data Solutions (International) Ltd., an English company and a 
wholly-owned subsidiary of Pledgor ("Borrower") and Pledgee, Pledgee advanced 
a loan to Borrower in the principal amount of Two Million Dollars 
($2,000,000.00) (the "Term Loan").  The Term Loan is evidenced by a Secured 
Promissory Note of even date herewith executed and delivered by Borrower to 
Pledgee in the principal amount of Two Million Dollars  ($2,000,000.00) (the 
"Note").  As incentive for Pledgee to make the Term Loan to the Borrower, the 
Pledgor executed a Guaranty in favor of Pledgee relating to the performance 
of Borrower's obligations under the Note and entered into a Security 
Agreement of even date herewith granting Pledgee a security interest in 
substantially all of the assets of Pledgor.  Borrower's obligations to 
Pledgee, as evidenced by the Note are hereinafter referred to as the 
("Obligations").  

     As additional Collateral Security to the Obligations, Pledgor has agreed 
to pledge to Pledgee all of Pledgor's right, title and interest in and to the 
Pledged Securities (as hereinafter defined).  

     NOW, THEREFORE, in consideration of the foregoing, and intending to be 
legally bound hereby, and for good, valuable and sufficient consideration, 
the receipt of which is hereby acknowledged, Pledgor agrees as follows:

     7.   Certain Definitions.

          (a)  The term "Pledged Securities" shall mean all shares of Capital 
Stock of: (i) CTI Delaware Holdings, Inc., a Delaware corporation; (ii) CTI 
Soft-Com, Inc., a Delaware corporation; (iii) Plymouth Communications, Inc., 
a Delaware corporation; (iv) Telephone Budgeting Systems, Inc., a Delaware 
corporation; and (v) Borrower, owned legally or beneficially by Pledgor, 
including all shares issued in the future, whether certificated or 
uncertificated, together with all certificates, options, rights, dividends or 
other distributions issued in addition to, in substitution or in exchange 
for, or on account of, any such shares, and all cash and noncash proceeds of 
all of the foregoing, now or hereafter owned, acquired by or arising in favor 
of Pledgor.





          (b)  The term "Event of Default" shall mean a default or an event 
of default under this Agreement, the Note or any other instrument, document 
or agreement, which evidences or secures the Obligations. 

     8.   Pledge.

          (a)  As security for the full and prompt satisfaction of the 
Obligations, Pledgor hereby pledges, hypothecates, delivers, transfers and 
sets over to Pledgee in form transferable for delivery, the Pledged 
Securities and grants to Pledgee a valid first priority lien on and security 
interest in and to the Pledged Securities, all certificates representing the 
Pledged Securities or other instruments or documents evidencing the same.

          (b)  Prior to the occurrence of an Event of Default, Pledgor shall 
be entitled to all voting rights with respect to the Pledged Securities and, 
for that purpose, Pledgee shall execute and deliver to Pledgor all necessary 
proxies. Immediately and without further notice, upon the occurrence of an 
Event of Default, whether or not the Pledged Securities shall have been 
registered in the name of Pledgee or its nominee, Pledgee or its nominee 
shall have the right to exercise all voting rights as to all of the Pledged 
Securities and all other corporate  rights and all conversion, exchange, 
subscription or other rights, privileges or options pertaining thereto as if 
Pledgee or its nominee were the absolute owner thereof including, without 
limitation, the right to exchange any or all of the Pledged Securities upon 
the merger, consolidation, reorganization, recapitalization or other 
readjustment of Pledgee thereof, or upon the exercise by Pledgee of any 
right, privilege, or option pertaining to any of the Pledged Securities and, 
in connection therewith, to deliver any of the Pledged Securities to any 
committee, depository, transfer agent, registrar or other designated agency 
upon such terms and conditions as it may determine, all without liability 
except to account for property actually received by Pledgee; but Pledgee 
shall have no duty to exercise any of the aforesaid rights or privileges, or 
may delay in so doing.

          (c)  Prior to the occurrence of an Event of Default, Pledgor shall 
be entitled to any and all regular cash dividends declared by the Pledgee to 
be paid on account of the Pledged Securities; provided, however, that 
immediately and without further notice, upon the occurrence of an Event of 
Default, whether or not the Pledged Securities shall have been registered in 
the name of Pledgee or its nominees, Pledgee or its nominee shall have the 
right to any and all regular cash dividends paid on account of the Pledged 
Securities which shall be delivered to Pledgee and may, at Pledgee's option, 
be applied on account of the Obligations in such order and manner as Pledgee 
may elect.

          (d)  At any time following execution of this Agreement, if Pledgor 
shall become entitled to receive or shall receive, in connection with any of 
the Pledged Securities, any: (i) stock certificate, including, without 
limitation, any certificate representing a stock dividend or in connection 
with any increase or reduction of capital, reclassification, merger, 
consolidation, sale of assets, combination of shares, stock split, spin-off 
or split-off; (ii) option, warrant or right, whether as an addition to or in 
substitution or in exchange for any of the Pledged Securities, or otherwise; 
or (iii) dividends or distributions payable in property, including securities 
issued by an issuer other than Pledgee; then, Pledgor shall accept the same 
as Pledgee's agent, in express trust for Pledgee, and shall deliver the same 
forthwith to the Pledgee in the exact form received with, as applicable, 
Pledgor's endorsement, or 


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appropriate stock powers duly executed in blank, (with signatures "bank 
guaranteed") which the Pledgor hereby unconditionally agrees to make and/or 
furnish, to be held by Pledgee, subject to the terms hereof, as part of the 
Pledged Securities. 

          (e)  The Pledgor hereby delivers to the Pledgee appropriate updated 
stock transfer powers duly executed in blank for the Pledged Securities and 
will deliver appropriate updated stock transfers powers duly executed in 
blank for any Pledged Securities to be pledged hereunder from time to time.

     9.   Remedies Upon an Event of Default.

          (a)  Upon the occurrence of an Event of Default, Pledgee shall have 
in each case all of the remedies of a secured party under the Pennsylvania 
Uniform Commercial Code, and, without limiting the foregoing, shall have the 
right, without demand of performance or other demand, advertisement, or 
notice of any kind (except the notice specified below of time and place of 
public or private sale or other disposition) to or upon the Pledgor or any 
other person (all of which are, to the extent permitted by law, hereby 
expressly waived), to forthwith realize upon the Pledged Securities or any 
part thereof, and may forthwith, or agree to, sell or otherwise dispose of 
and deliver the Pledged Securities or any part thereof or interest therein, 
in one or more parcels at public or private sale or sales, at any exchange, 
broker's board or elsewhere, at such prices and on such terms (including, 
without limitation, a requirement that any purchaser of all or any part of 
the Pledged Securities purchase the shares constituting the Pledged 
Securities for investment and without any intention to make a distribution 
thereof) as Pledgee shall, in its sole discretion, determine (the Pledgor 
hereby waiving and releasing any and all right or equity of redemption 
whether before or after sale hereunder) for or on credit, or for future 
delivery without assumption of any credit risk, with the right to Pledgee or 
any purchaser to purchase upon any such sale or acquire pursuant to (i) above 
the whole or any part of the Pledged Securities free of any right or equity 
of redemption in Pledgor, which right or equity is hereby expressly waived 
and released.  Pledgee agrees to give at least ten (10) days written notice 
of the time and place of any public sale or of the time after which a private 
sale or other disposition may take place, which notice Pledgor hereby deems 
commercially reasonable.

          (b)  The proceeds of any disposition of the Pledged Securities or 
other action by Pledgee shall be applied as follows:

               (i)  First, the costs and expenses incurred in connection 
therewith or incidental thereto or to the care or safekeeping of any of the 
Pledged Securities or in any way relating to the rights of Pledgee hereunder, 
including reasonable attorneys' fees and legal expenses;

               (ii) Second, to the satisfaction of the Obligations;


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              (iii) Third, to the payment of any other amounts required by 
applicable law (including, without limitation, Section 9-504(a)(3) of the 
Uniform Commercial Code as enacted in the Commonwealth of Pennsylvania (the 
"UCC"); and

               (iv) Fourth, to Pledgor, to the extent of any surplus 
proceeds, absent the agreement of the parties to the contrary or as a court 
of competent jurisdiction may direct.  

     10.  Pledgor's Representations and Warranties.  Pledgor represents and
warrants that:

          (a)  Pledgor has all requisite capacity and power to enter into 
this Pledge, to pledge the Pledged Securities for the purposes described in 
Paragraph 2(a) above, and to carry out the transactions contemplated by this 
Pledge;

          (b)  Pledgor is the legal and beneficial owner of the Pledged 
Securities free and clear of all liens, security interests and other 
encumbrances except the security interest granted hereby.  The Pledged 
Securities include all issued and outstanding capital stock of each issuer 
thereof.  All of the Pledged Securities have been duly authorized and validly 
issued and are fully paid and non-assessable and are subject to no option to 
purchase or similar rights of any person or entity.  Pledgor is not, and will 
not become, a party to or bound by any agreement which restricts in any 
manner the rights of any present or future holder of any of the Pledged 
Securities with respect thereto.;

          (c)  The execution and delivery of this Pledge, and the performance 
of its terms, will not violate or constitute a default under the terms of any 
agreement, indenture or other instrument, license, judgment, decree, order or 
regulation, applicable to Pledgor or any of its property; and

          (d)  Upon the execution of this Pledge and the delivery to Pledgee 
of the shares of Pledged Securities now held of record by Pledgor, this 
Pledge shall create a valid first priority lien upon and perfected security 
interest in the Pledged Securities and the cash and noncash proceeds thereof, 
subject to no prior lien or subordinate lien, or agreement purporting to 
grant to any third party a security interest in the property or assets of 
Pledgor which would include the Pledged Securities.

     11.  Pledgor's Covenants.  Pledgor hereby covenants that, until all of 
the Obligations have been satisfied in full:

          (a)  Pledgor will not sell, convey, or otherwise dispose of any of 
the Pledged Securities or any interest therein, or create, incur, or permit 
to exist any pledge, mortgage, lien, charge, encumbrance or any security 
interest whatsoever in or with respect to any of the Pledged Securities or 
the proceeds thereof, other than that created hereby; and 


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          (b)  Pledgor will, at Pledgor's own expense, defend (engaging 
counsel acceptable to Pledgee) Pledgee's right, title, special property and 
security interest in and to the Pledged Securities against the claims of any 
person, firm, corporation or other entity.

     12.  Further Assurances.  Pledgor shall at any time, and from time to 
time, at its sole expense, upon written request of Pledgee, execute and 
deliver such further documents and do such further acts and things as Pledgee 
may reasonably request to effect the purposes of this Pledge including, 
without limitation, delivering to Pledgee, upon the occurrence of an Event of 
Default, irrevocable proxies with respect to the Pledged Securities in form 
satisfactory to Pledgee. Until receipt thereof, this Pledge shall constitute 
Pledgor's proxy to Pledgee or his nominee to vote all shares of Pledged 
Securities then registered in Pledgor's name.  To the extent permitted by 
law, Pledgor authorizes Pledgee to execute and file, in Pledgor's name or 
otherwise, Uniform Commercial Code financing statements (which may be copies 
of this Pledge) that the Pledgor in its sole discretion may deem necessary or 
appropriate to further perfect the security interest herein. 

     13.  Termination of Pledge.  Upon the satisfaction in full of all 
Obligations and the satisfaction of all additional costs and expenses of 
Pledgee as provided herein, this Pledge shall terminate and Pledgee shall 
deliver to Pledgor, the Pledged Securities or so much thereof as shall not 
have been sold or otherwise applied pursuant to this Pledge.

     14.  Miscellaneous.

          (a)  Beyond the exercise of reasonable care to assure the safe 
custody of the Pledged Securities while held hereunder, Pledgee shall have no 
duty or liability to preserve rights pertaining thereto and shall be relieved 
of all responsibility for the Pledged Securities upon surrendering the 
Pledged Securities or tendering surrender of it to Pledgor.

          (b)  The rights and remedies provided herein and in the Note and 
any related instruments, agreements and documents are cumulative and are in 
addition to and not exclusive of any rights or remedies provided by law, 
including, without limitation, the rights and remedies of a secured party 
under the UCC. 

          (c)  The provisions of this Pledge are severable, and if any clause 
or provision shall be held invalid or unenforceable in whole or in part in 
any jurisdiction and shall not in any manner affect such clause or provision 
in any other jurisdiction or any other clause or provision in this Pledge in 
any jurisdiction.

     15.  Notices.  All notices and other communications hereunder shall be 
in writing and shall be deemed to have been validly given, as of the date 
delivered, if delivered personally, three days after being sent by registered 
or certified mail (postage prepaid, return receipt requested), one day after 


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dispatch by recognized overnight courier (provided delivery is confirmed by 
the courier) and upon transmission by telecopy, confirmed received, to the 
parties at the following addresses (or at such other address for a party as 
shall be specified by like change of address):

          (a)  If to Pledgee:

               Siemens plc
               Siemens House
               Oldbury, Bracknell
               Berkshire, R 912 8FZ (England)
               Attention: James Loughery
               Facsimile No.: 011-44-1344-396020

               With a copy to:

               Siemens Corporation
               1301 Avenue of the Americas
               New York, NY 10019
               Attention: Kevin M. Royer
               Facsimile No.: (212) 258-4945
          (a)  If to Pledgor:

               CTI Group (Holdings), Inc.
               901 South Trooper Road
               P.O. Box 80360
               Valley Forge, Pennsylvania 19484 (USA)
               Attention: Anthony Johns
               Facsimile No.: (610) 666-7707

with copies to:
               Klehr, Harrison, Harvey, Branzburg & Ellers LLP
               1401 Walnut Street
               Philadelphia, Pennsylvania 19102 (USA)
               Attention: Barry J. Siegel, Esquire
               Facsimile No.: (215) 568-6603


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     16.  Governing Law.  This Pledge shall be construed in accordance with 
the substantive laws of the Commonwealth of Pennsylvania without regard to 
principles of conflicts of laws and is intended to take effect as an 
instrument under seal.

     17.  Jurisdiction.  The parties agree to the exclusive jurisdiction of 
the federal courts located in Philadelphia, Pennsylvania in connection with 
any matter arising hereunder, including the collection and enforcement 
hereof.  THE PARTIES HERETO IRREVOCABLE WAIVE TRIAL BY JURY IN ANY 
JURISDICTION AND IN ANY COURT WITH RESPECT TO, IN CONNECTION WITH, OR ARISING 
OUT OF THIS AGREEMENT OR ANY OTHER INSTRUMENT OR DOCUMENT DELIVERED PURSUANT 
HERETO OR THERETO OR ANY OTHER CLAIM OR DISPUTE HOWEVER ARISING BETWEEN THE 
GUARANTOR AND THE SECURED PARTY.

     IN WITNESS WHEREOF, Pledgor has executed this Collateral Pledge 
Agreement as of the day and year first above written.


WITNESS:                                CTI GROUP (HOLDINGS), INC.


/s/ Mary Ann Davis                      /s/ Anthony Johns
- ---------------------                   ----------------------------
                                        By: Anthony Johns, President


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