2007年12月20日 星期四

SIP Transaction and Dialog parameters

Transaction:
Via - Must contain a branch parameter to identify the transaction created by that request. The branch ID must always begin with the characters “z9hG4bK” as a magic cookie.
Branch parameter “branch=z9hG4bK776asdhds” to identify the transaction


Dialog:
The combination of the “To tag”, “From tag”, and “Call-ID” completely defines a peer-to-peer SIP relationship between Alice and Bob and is referred to as a dialog.

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