Home » Cisco » 400-051 » Which method does a Cisco Unified 9971 phone use to send keep-alive messages to Cisco Unified Communications Manager?
Which method does a Cisco Unified 9971 phone use to send keep-alive messages to Cisco Unified Communications Manager?
A. SIP NOTIFY with Event set to keep-alive
B. SIP OPTIONS
C. SIP REGISTER with Expires set to zero
D. SCCP StationRegister
E. SCCP StationServerReq
Correct Answer: C
Explanation/Reference:
Explanation:
Phone registers with primary and establishes keepalive connection with secondary.
Expires = 0 keepalive mechanism allows Cisco SIP Phones to more closely resemble the failover / fallback behavior of SCCP.
