TISPAN NGN Release 1 was published in December 2005 and contained the architectural foundations and basic specifications required in support of PSTN replacement.
The TISPAN NGN architecture is based on sharing common components between cooperating subsystems.
TISPAN has been working with 3GPP to extend the IMS architecture with capabilities required in support of wire-line access.
TISPAN NGN Release 2 was finalized early 2008, and added support for IPTV services and Business Communications[1] over the IMS.
The TC has adopted the 3GPP™ core IMS specifications using Internet (SIP) protocols to allow features such as Presence, IPTV, Messaging, and Conferencing to be delivered irrespective of the network in use.