Appendix B SIP Call Flows
Call Flow Scenarios for Failed Calls
Cisco SIP IP Phone-to-Cisco SIP IP Phone—Called User is Busy
Figure B-16 illustrates an unsuccessful call in which User A initiates a call to User B but User B is on the phone and is unable or unwilling to take another call.
Figure B-16 Cisco SIP IP Phone-to-Cisco SIP IP Phone—Called User is Busy
SIP IP | IP Network | SIP IP |
Phone User A | Phone User B | |
IP |
| IP |
1.INVITE B
2.486 Busy Here
3.ACK
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