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"The PINT Service Protocol: Extensions to SIP and SDP for IP Access to Telephone Call Services" , RFC 2848
"Common Gateway for SIP" ,RFC 3050
"Control of Service Context using SIP-Request URI",RFC 3087
"Telephony Routing over IP (TRIP)", RFC 3219, January 2002.

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Posted by sagitraz

2848- PINT Extensions for SIP
3050- Common Gateway for SIP
3087- Content Service Context using SIP
3219- Telephone Routing Protocol (TRIP)

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Posted by yogendra