Cisco 400-051 Exam

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
Answer: Option C.
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.

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