Filed by GraphOn Corporation
                           pursuant to Rule 425 under the Securities Act of 1933
                                           and deemed filed pursuant Rule 14a-12
                                          of the Securities Exchange Act of 1934
                                                     Commission File No: 0-21683
                         Subject Companies: Cortelco Systems Holding Corporation
                                                Cidco Communications Corporation
                                                   SLL Communications Coporation



THE FOLLOWING SCRIPT WAS USED BY GRAPHON CORPORATION DURING A CONFERENCE CALL ON
AUGUST 21, 2002.

To comply  with  applicable  SEC  regulations,  I must  first  inform you of the
following:

GraphOn will file a proxy statement/prospectus and other relevant documents with
the SEC concerning the proposed merger transaction.  INVESTORS ARE URGED TO READ
THE PROXY  STATEMENT/PROSPECTUS WHEN IT BECOMES AVAILABLE AND ANY OTHER RELEVANT
DOCUMENTS  FILED WITH THE SEC BECAUSE THEY WILL CONTAIN  IMPORTANT  information.
You  will be  able to  obtain  the  documents  free  of  charge  at the  website
maintained  by the SEC at  www.sec.gov.  In addition,  you may obtain  documents
filed with the SEC by GraphOn free of charge by requesting  them in writing from
GraphOn  Corporation,   11711  South  East  8th  Street,  Suite  215,  Bellevue,
Washington 98005;  Attention:  Corporate  Secretary,  or by telephone,  at (425)
818-1400.

GraphOn and its  directors  and  executive  officers,  and other  members of its
management and employees,  may be deemed to be participants in the  solicitation
of proxies  from the  stockholders  of GraphOn in  connection  with the  merger.
INFORMATION  ABOUT THE  DIRECTORS  AND  EXECUTIVE  OFFICERS OF GRAPHON AND THEIR
OWNERSHIP OF GRAPHON  COMMON STOCK IS SET FORTH IN  GRAPHON'S  ANNUAL  REPORT ON
FORM 10-K, AS AMENDED. Investors may obtain additional information regarding the
interests of such participants by reading the proxy statement/prospectus when it
becomes available.

Having  now  attended  to the  required  legalities,  let me tell you  about the
proposed merger. In an effort to build our revenue base, we have been looking at
businesses  that we could  acquire  that  would  give us more size and mass over
which to spread our operating costs. Obviously, we favored companies that have a
lot of synergies  with the GraphOn  business.  As it turns out, the two or three
that fell into that  category  required  more cash than we could provide and did
not  provide  sufficient  revenue to  support  the  operating  costs of a public
company.

We did find a very exciting opportunity. We expect there will be some synergies,
because the new  business is beginning to  differentiate  its products  based on
software,  and we bring to the combined  companies broad skills in that area. We
are  presenting  to the  stockholders  a proposal  that GraphOn merge with three
privately-held affiliated entities.

One is Cidco Communications  Corporation,  a company that provides  feature-rich
residential  telephone  equipment  to  telephone  operating  companies in global
markets.  The company has had a long history of selling to the global  telephone
operating  companies,  commonly  known as "telcos",  and pioneered the equipment
that  allowed  caller ID  services.  The company  has a broad line of  telephone
products. We expect Cidco sales to grow during 2003 for a couple of reasons. The
company  has  recently  announced  a new line of  cordless  telephones,  and the
product has been well  received by the  industry.  In  addition,  the  telephone
operating  companies are  experiencing,  for the first time in their history,  a
reduction  in phone  lines.  This is primarily  due to the  introduction  of new
wireless  services.  To maintain  their revenue base, the telcos are looking for
equipment  that will enhance the value added  services  they  provide.  They are
planning to offset the revenue lost in wired lines by  increasing  their revenue
with  services  such as Caller ID,  Call  Forwarding,  Call  Waiting.  Answering
Services,  etc.  Cidco  products  are  designed  specifically  to enhance  these
features.  Cidco treats telcos as an exclusive  distribution  channel, and their
products are not available in the retail market.

The second  company is Cortelco  Inc. This company has over 100 years of history
of providing telephone equipment to the communications industry. It was formerly
a part  of ITT  and  has a long  history  of  providing  high  quality  reliable
telephone  handsets.  The company's  strongest  distribution  channel is through
major  distributors,  such as Graybar and Alltel.  In addition,  Cortelco  sells
telephones to a number of telephone service providers worldwide.  If you pick up
a telephone in many hotels or  businesses it is not unusual to see it is made by
ITT or Cortelco.

Cortelco  also has a new  product  in  development.  A  wireless  PBX for retail
warehouse  applications where employees are mobile in a building.  This is a new
product  in  development  and is being  beta  tested  by a number  of  potential
customers.  No sales  have been  recorded  for this  product  to date.  This new
product  has the  potential  to  provide  revenue  growth  for  what  has been a
consistently profitable company.

The  third  entity  is SLL  Communications  Corporation.  SLL is a new  start-up
company  established to develop voice over IP telephone  products.  As I am sure
you are aware,  this is a new, fast growing  market,  and voice over IP products
are winning new  applications,  especially in private  corporate  networks.  The
products are designed to work both on new  IP-Centrex  systems  being offered by
the telcos,  and on premises based LAN systems.  The telcos  currently have over
17M Centrex  lines that are expected to migrate from analog to IP over time.  We
believe  the long  relationship  Cidco  has had with the  former  regional  Bell
operating companies, or "RBOCS", will allow us to capture a significant share of
the voice over IP handset  market in the Centrex area.  We further  believe that
the migration of SLL's technology to other VOIP systems will provide new revenue
opportunities as well.

In summarizing these three companies,  they have a solid  traditional  telephone
handset business with proven distribution  channels.  In addition they have some
exciting  growth  opportunities  in the voice over IP and  cordless  or wireless
products.  Obviously  there will be  significant  changes to the  complexion  of
GraphOn and stockholders  will have stock in a very different  company after the
merger.  The three Telco  companies  when combined with GraphOn will have annual
revenues that exceed $75 million.

We presently expect that the closing of the proposed merger,  which, among other
matters, will require the prior clearance of proxy solicitation materials by the
SEC and a  favorable  vote of our  stockholders,  will take place in November of
this year.  Upon  completion,  the current  stockholders  of GraphOn will retain
ownership of approximately  30% of GraphOn's  outstanding  common stock. We also
expect  that  GraphOn's  common  stock will  continue to be traded on the Nasdaq
Small-Cap Market following the completion of the merger.

Because of SEC disclosure regulations, I regret that I cannot take any questions
with  respect to the proposed  mergers at this time.  You will have to await the
issuance of our proxy statement.

This presentation  contains  statements that are forward looking as that term is
defined by the United States Private  Securities  Litigation Reform Act of 1995.
These statements are based on current expectations that are subject to risks and
uncertainties.  Actual  results  will  differ due to  factors  such as shifts in
customer demand,  product shipment schedules,  product mix, competitive products
and pricing,  technological shifts and other variables.  Readers are referred to
GraphOn's  most recent  periodic and other reports filed with the Securities and
Exchange Commission.