Company contacts:                                   Agency contacts:
Ney Grant                                           William Orrange
Castelle, Ibex Division                             Janis Ulevich
916-939-8888                                        Ulevich & Orrange, Inc.
ngrant@ibex.com                                     415-329-1590
                                                    info@u-o.com
Randy Bambrough
Castelle Corporate Headquarters
408-496-0474
Randy.Bambrough@castelle.com                              FOR IMMEDIATE RELEASE


               CASTELLE COMPLETES ACQUISITION OF IBEX TECHNOLOGIES

         SANTA  CLARA,  Calif.,  Nov.  21,  1996 --  Castelle  (NSDQ:  CSTL) has
completed its acquisition of Ibex  Technologies,  Inc., a privately held company
that is the market leader in fax-on-demand systems.
         The acquisition  follows an agreement  signed on August 22, 1996, under
which  Castelle  agreed to  acquire  all the  outstanding  Ibex  stock and stock
options  in  exchange  for  850,000  shares  of  Castelle   common  stock.   The
acquisition,  approved  by  Castelle  and Ibex  shareholders  on November 19 and
November 18 respectively, is intended to be tax free in nature and accounted for
as a pooling of interests for financial statement purposes.
         The  newly   created  Ibex   Division  of  Castelle   remains  at  Ibex
headquarters  in El Dorado Hills,  Calif.  Ney Grant,  former Ibex president and
CEO, has been appointed Castelle's vice president of marketing.
         In  announcing  the August 22  agreement,  Art Bruno,  Castelle CEO and
chairman,  said,  "Castelle and Ibex have truly  complementary  sales  channels.
Together  these  channels  will  expand  both  companies'  sales  opportunities,
enabling  Ibex to  deliver  fax-on-demand  to the mass  market and  Castelle  to
penetrate large enterprises with its LAN fax solutions."
         In October,  Castelle introduced InfoPress,  a product which integrates
technology from Castelle and Ibex. InfoPress users can implement highly flexible
information  publishing  via fax, email and the World Wide Web, or add email and
fax delivery capabilities to existing Web sites.
         Castelle,  founded in 1987,  designs,  develops,  markets and  supports
internetwork   fax-   and   print-server    products   for   workgroups,    plus
fax/email-on-demand,  fax gateway,  fax broadcast and Web fax systems.  Products
are available  through a worldwide  network of more than 40  distributors  in 31
countries.  The company also has relationships  with selected original equipment
manufacturers  and  system  integrators  and  sells  software  enhancements  and
upgrades   directly  to  end  users.   The  company,   publicly  traded  on  the
over-the-counter  market under the NASDAQ symbol CSTL, is headquartered in Santa
Clara, California.
                   

                                       6.