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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