branch -- A field in VIA headers, identify a transaction.
tag -- A field in FROM or TO headers,
call-id -- globalunique identifier for a call.
dialog-id -- The combination of the To tag, From tag, andCall-ID completely defines a peer-to-peer SIP relationship between Alice andBob and is referred to as a dialog.
RESPONSE -- This response contains the same To, From,Call-ID, CSeq and branch parameter in the Via as the INVITE, which allows Alice’s softphone tocorrelate this respons......
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