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

By Cisco · Question Mode

QuestionQ250

Protocols and Endpoints

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Refer to the exhibit. While troubleshooting DTMF negotiated by this SIP INVITE, which two messages should a UC Administrator examine next to investigate the issue further?

Choose two
  • A REGISTER
  • B UPDATE
  • C PRACK
  • D NOTIFY
  • E SUBSCRIBE
Explanation

The SDP does not advertise an RTP telephone-event payload for RFC 2833 DTMF. Cisco KPML out-of-band DTMF uses a SIP SUBSCRIBE request to establish the KPML subscription and SIP NOTIFY messages to carry the XML-encoded DTMF events.

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