Rapporteur: Dr. Swetina, Joerg See also:
ETSI (TISPAN) TS 181 001
This TS defines the requirements for a videotelephony service which may be supported by a TISPAN NGN. These requirements form the basis for the definition of network capabilities.
This TS provides interoperability service requirements for interconnection between existing networks and a TISPAN NGN, and between TISPAN NGN.
This TS only provides requirements for IP multimedia based networks. Services provided by a TISPAN NGN to support legacy terminals and interfaces (PSTN/ISDN emulation) are defined in existing PSTN/ISDN documents. Requirements for PSTN/ISDN emulation are out of scope of this TS and are described in other documents.
The applicability of PSTN/ISDN simulation services to the videotelephony service requirements are defined in this TS.
The requirements in this TS are described from the user point of view. The requirements do not take into account capabilities of existing protocols defined for the IMS. The evolution or modifications to these protocols are beyond the scope of this TS.
NOTE: This TS uses the term "NGN" only in the context of TISPAN.