INVITE sip:1002@1.2.3.4:56761;transport=UDP;rinstance=dc6b6c3baf77a97a SIP/2.0
Via: SIP/2.0/UDP 5.6.7.8:5060;rport;branch=z9hG4bKPj0f7ae24e-d7b6-446b-b65e-72e6d68a74ee
From: <sip:74993466302@5.6.7.8>;tag=81bb91e5-1fb5-46db-b039-ad8547d8f7bd
To: <sip:1002@1.2.3.4;rinstance=dc6b6c3baf77a97a>