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SIP/2.0 180 Ringing Via: SIP/2.0/UDP csvax.cs.caltech.edu;branch=7c337f30d7ce.1 ;maddr=239.128.16.254;ttl=16 Via: SIP/2.0/UDP north.east.isi.edu From: Alice <sip:alice@wonderland.com>;tag=1 To: Bob <sip:bob@example.com> ;tag=3141593 Call-ID: 602214199@mouse.wonderland.com CSeq: 1 INVITE