Appendix B SIP Call Flows
Call Flow Scenarios for Failed Calls
Cisco SIP IP
Figure B-17 illustrates an unsuccessful call in which User A initiates a call to User B but User B does not answer.
Figure B-17 Cisco SIP IP Phone-to-Cisco SIP IP Phone—Called User Does Not Answer
SIP IP | IP Network | SIP IP |
Phone User A | Phone User B | |
IP |
| IP |
1.INVITE B
2.180 Ringing
3.CANCEL
4.200 OK
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| Cisco SIP IP Phone 7960 Administrator Guide |
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