Cisco 400-051 Exam

What does a Cisco Expressway-E do when it receives a SIP REGISTER message from a Jabber client for MRA phone service registration?

  • A. It performs a DNS lookup for the Expressway-C and establishes a new TCP connection to it before forwarding the REGISTER message to the Expressway-C
  • B. It sends a 200 OK for the REGISTER back to the Jabber client if this client has previously been provisioned through the Expressway E and C pair
  • C. It sends a timestamped SERVICE message to the Expressway-C before forwarding the REGISTER message to the Expressway-C
  • D. It forwards the REGISTER message to the Expressway-C which then forwards it to the UCM for phone service registration
Answer: Option B.
Explanation: 
No answer description available for this question

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