Cisco 400-051 Exam

A CUCM engineer has deployed Type B SIP Phones on a remote site and no SIP dial rules were deployed for these phones. How Will CUCM receive the DTMF after the phone goes off- hook and the button are pressed?

  • A. Each digit will be received by CUCM in a SIP NOTIFY message as soon as they are pressed
  • B. The first digit will be received in a sip invite and subsequent digits will be received using NOTIFY message as soon as they are pressed.
  • C. Each digit bill be received by CUCM in a SIP INVITE as soon as the dial soft key has been pressed.
  • D. All digits will be received by CUCM in a SIP INVITE as soon as the dial soft key has been pressed
Answer: Option A.

Type-B IP telephones offer functionality based on the Key Press Markup Language (KPML) to report user key presses. Each one of the user input events will generate its own KPML- based message to Unified CM. From the standpoint of relaying each user action immediately to Unified CM, this mode of operation is very similar to that of phones running SCCP.
Every user key press triggers a SIP NOTIFY message to Unified CM to report a KPML event corresponding to the key pressed by the user. This messaging enables Unified CM’s digit analysis to recognize partial patterns as they are composed by the user and to provide the appropriate feedback, such as immediate reorder tone if an invalid number is being dialed. In contrast to Type-A IP phones running SIP without dial rules, Type-B SIP phones have no Dial key to indicate the end of user input. A user dialing 1000 would be provided call progress indication (either ringback tone or reorder tone) after dialing the last 0 and without having to press the Dial key. This behavior is consistent with the user interface on phones running the SCCP protocol.

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