3GPP P-Headers

The Third Generation Partnership Project (3GPP) has defined some additional SIP P-headers ('P' stands for private or proprietary) to use in IMS (Release 5 requirements on SIP) context.

These headers are:

1. The P-Associated-URI header
2. The P-Called-Party-ID header
3. The P-Visited-Network-ID header
4. The P-Access-Network-Info header
5. The P-Charging-Function-Addresses header
6. The P-Charging-Vector header

In next posts I will explain how these headers are used in both UAC and UAS side.

For more information visit http://www.ietf.org/rfc/rfc3455.txt