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Appendix B SIP Call Flows
Call Flow Scenarios for Failed Calls
B-66
Cisco SIP IP Phone 7960 Administrator Guide
78-10497-02
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
IP IP
2. 486 Busy Here
3. ACK
1. INVITE B
IP Network
SIP IP
Phone User A
SIP IP
Phone User B
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