Cisco 400-051 Exam

Refer to the exhibit. Which out-of-dialog SIP OPTIONS ping response put dial-peer tag 1111 into its current operational state?

  • A. 501 Not Implemented
  • B. 504 Server Time-out
  • C. 408 Request Timeout
  • D. 486 Busy Here
  • E. 503 Service Unavailable
Answer: Option E.

SIP 503 Service Unavailable is commonly seen in a VoIP network when a SIP device (such as a SIP server) is knowingly unable to process a call. Typically when this happens the endpoint that originated the Invite will try the next available host it receives in the SIP Contact header.

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