3GPP Work Item description

This page contains informal descriptive text only.  See master WID page for further details.

Feature: Multimedia Telephony Capabilities for IMS

In addition to reusing the IMS system as defined by 3GPP, TISPAN is defining an IMS based Multimedia Telephony service, which is an evolution of the CS based Telephony service provided by traditional ISDNs and PSTNs.
A similar service, defined by 3GPP, is needed for wireless access to IMS, in order to be able to define services to the end-users, and to support interoperability in multi-vendor and multi-operator environment and to provide the user with the same experience across the different IP based accesses and domains.

(TISPAN document is DTS TISPAN-01002-NGN).

The objective is to define the minimum set of capabilities required to secure multi-vendor and multi-operator inter-operability for Multimedia Telephony and related Supplementary Services. 

Close cooperation shall be sought with TISPAN. TISPAN requirements, as captured in TISPAN-01002-NGN, shall be taken into account, and referred to where appropriate.

The objective is to reuse and build on IMS capabilities provided in Release 5 and Release 6.

Service Aspects: 

While the user experience for Multimedia Telephony is expected to have some similarity to existing telephony services, the richer capabilities of IMS should be exploited.

Impacts on the requirements of the multimedia enablers (captured in TS 22.228) may be identified. 

Co-operation with, and consideration to the ongoing TISPAN work is necessary to ensure that the services work over multiple access technologies.