RFC3725 Best Current Practices for Third Party Call Control (3pcc) in the Session Initiation Protocol (SIP)
RFC3725 Best Current Practices for Third Party Call Control (3pcc) in the Session Initiation Protocol (SIP) J. Rosenberg, J. Peterson, H. Schulzrinne, G. Camarillo [ April 2004 ] ( TXT = 77308 bytes)(Also BCP85)
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