The 3rd Generation Partnership Project (3GPP) is a collaboration agreement that was established in December 1998.
The scope of 3GPP was to make a globally applicable third generation (3G) mobile phone system specification within the scope of the ITU's IMT-2000 project. 3GPP specifications are based on evolved GSM specifications, now generally known as the UMTS system. Note that 3G Networks based on IS-95 (CDMA) networks, commonly known as CDMA2000, are specified by a different group confusingly known as 3GPP2.
In general, the SIP inbound proxy and the SIP outbound proxy are the same SIP proxy.
In the 3GPP IMS, the mobile terminals might have restrictions with the memory, DSP capacity, etc. As such, a mechanism is required by which the Session Description negotiation may conclude with one out of many codecs per media stream.
Garcia-Martin Informational [Page 26] RFC 4083 3GPP R5 Requirements on SIP May 2005 A user's authentication is automatically invalidated when a certain threshold for charges (or number, or duration of sessions) is reached without giving the user a chance to re-authenticate, even if a valid registration exists.
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