Exhibit 99.1

               InterDigital Issues Revenue Guidance for
                         Fourth Quarter 2005

    KING OF PRUSSIA, Pa.--(BUSINESS WIRE)--Dec. 1, 2005--InterDigital
Communications Corporation (Nasdaq:IDCC), a leading designer,
developer and provider of wireless technology and product platforms,
today announced that it expects fourth quarter 2005 revenue related to
patent license royalties and technology solution agreements to be in
the range of approximately $39 million to $42 million.
    InterDigital anticipates recurring patent licensing royalty
revenue to be between approximately $36 million and $37 million for
fourth quarter 2005. This royalty guidance is based on per-unit
royalty reports received from the majority of current licensees. In
addition, the company expects its revenues from technology solution
agreements to contribute an additional $3 million to $5 million to
fourth quarter 2005 revenue.
    Richard Fagan, InterDigital's Chief Financial Officer, noted, "We
are pleased to close out 2005 with a solid fourth quarter which
reflects the benefit of our expanding base of 3G patent licensees and
continued contributions from technology customers. We expect full year
2005 recurring patent license royalties to be well over $100 million.
For 2006, we remain optimistic about our prospects for growth as we
continue to capitalize on opportunities in the growing 3G market."

    About InterDigital

    InterDigital Communications Corporation designs, develops and
provides advanced wireless technologies and products that drive voice
and data communications. InterDigital is a leading contributor to the
global wireless standards and holds a strong portfolio of patented
technologies which it licenses to manufacturers of 2G, 2.5G, 3G and
802 products worldwide. Additionally, the company offers baseband
product solutions and protocol software for 3G multimode terminals and
converged devices. InterDigital's differentiated technology and
product solutions deliver time-to-market, performance and cost
benefits. For more information, please visit InterDigital's web site:
www.interdigital.com. InterDigital is a registered trademark of
InterDigital.

    This press release contains forward-looking statements regarding
our current beliefs, plans and expectations as to fourth quarter 2005
revenue including revenues from patent licensing royalties and
revenues from technology solution agreements and prospects for growth
in 2006. Forward-looking statements are subject to risks and
uncertainties. Actual outcomes could differ materially from those
expressed in or anticipated by such forward-looking statements due to
a variety of factors including, but not limited to, the receipt of new
or updated royalty reports from current licensees, the execution of
any new license agreements in 2005, unanticipated revisions to our
expectations as to our progress toward completion of our agreements
with General Dynamics and Philips, and the ability to enter into new
license agreements in 2006.



    CONTACT: InterDigital Communications Corporation
             Media Contact:
             Jack Indekeu, 610-878-7800
             jack.indekeu@interdigital.com
                 or
             Investor Contact:
             Janet Point, 610-878-7800
             janet.point@interdigital.com