350-801 CLCOR: Implementing and Operating Cisco Collaboration Core TechnologiesDemo

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QuestionQ373

Media and QoS

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Refer to the exhibit. The SDP offer/answer exchange completed successfully, but no DTMF is received when users press keys. What is causing the issue?

  • A DTMF was negotiated properly in these messages.
  • B G.729 rather than G.711ulaw was negotiated.
  • C Payload type 110 was negotiated rather than type 101.
  • D DTMF was not negotiated on the call.
Explanation

The offer advertises telephone-event DTMF using dynamic payload type 110, but the answer includes only payload type 18 for G.729 and omits telephone-event. Since the answer does not accept that media format, DTMF events were not negotiated for the call.

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