Cisco 400-051 Exam

Which device is the initiator of a StationD message in a Cisco Unified Communications Manager SDI trace?

  • A. SCCP IP phone
  • B. SIP IP phone
  • C. Cisco Unified Communications Manager
  • D. MGCP analog gateway
  • E. digital voice gateway
Answer: Option C.
Explanation: 

All messages to and from a skinny device are preceded by either the words StationD or StationInit. StationD messages are sent from call manager to IP phone. Skinny message transmission such as this between the IP phone and CallManger occurs for every action undertaken by the IP phone, includinginitialization, registration, on-hook, off-hook, dialing of the digits, key press on the phone, and so much more.

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