The 3rd Generation Partnership Project (3GPP) is a collaboration agreement that was established in December 1998. The collaboration agreement brings together a number of telecommunications standards bodies which are known as “Organizational Partners”. The current Organizational Partners are ARIB, CCSA, ETSI, ATIS, TTA, and TTC (http://www.3gpp.org).
The earliest efforts to standardize NGN architecture originates from the Third-Generation Partnership Project (3GPP), a partnership between different standardization bodies. In 2003, 3GPP finalized the first release of an architecture known as the IP Multimedia Subsystem (IMS) Release 5 (R5). Its original formulation (3GPP R5) represented an approach to delivering "Internet services" or multimedia communication services over GPRS (to mobile end users).
It must be noted that another initiative, named 3GPP2, works on a functionally identical IMS standard adapted for 3G networks originating from CDMA2000 1x RTT 2G radio-based networks.
Source: ITU, 3GPP
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