Cisco Sip Ip Phone-To-Cisco Sip Ip Phone-Authentication Error - Cisco 7960 Administrator's Manual

Call Flow Scenarios for Failed Calls
Cisco SIP IP Phone-to-Cisco SIP IP Phone—Authentication Error
Figure B-18 illustrates an unsuccessful call in which User A initiates a call to
User B but is prompted for authentication credentials by the proxy server. User
A's SIP IP phone then reinitiates the call with an SIP INVITE request that includes
it's authentication credentials.
Figure B-18 Cisco SIP IP Phone-to-Cisco SIP IP Phone—Authentication Error
SIP IP
Phone User A
IP
1. INVITE B
2. 407 Authentication Error
3. ACK
4. Resend INVITE B
Cisco SIP IP Phone 7960 Administrator Guide
B-70
Proxy
Server
Appendix B
IP Network
SIP Call Flows
SIP IP
Phone User B
IP
78-10497-02