[ Line 1 ] SIP/2.0 180 Ringing
[ Line 2 ] Via: SIP/2.0/UDP 192.168.1.15:5060;branch=z9hG4bK3298736468smg;transport=UDP
[ Line 3 ] To: <sip:+10123456789@ims.sharetechnote.com>;tag=123456789
[ Line 4 ] From: <sip:+11234567890@ims.sharetechnote.com>;tag=659747293
[ Line 5 ] Max-Forwards: 70
[ Line 6 ] Contact: <sip:+10123456789@192.168.1.2:5060;transport=udp>
[ Line 7 ] Call-ID: 131949458@192.168.1.15
This SIP message clip highlights the following parameters: Via, Contact, Call-ID, From, To, Max-Forwards. Use these fields to correlate routing, dialog identity, transaction sequencing, registration/session state, security context, and media negotiation for this part of the procedure.
[ Line 9 ] CSeq: 1 INVITE
[ Line 10 ] Content-Length: 0
This SIP message clip highlights the following parameters: Via, Contact, CSeq, Call-ID, From, To, Content-Length, Max-Forwards. Use these fields to correlate routing, dialog identity, transaction sequencing, registration/session state, security context, and media negotiation for this part of the procedure.