Cisco Sip Ip Phone-To-Cisco Sip Ip Phone-Called User Is Busy - Cisco 7960 Administrator's Manual

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