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QuestionQ151

Voice Gateways and Session Border Controllers

A Cisco voice gateway is configured globally to use a sip-kpml DTMF relay. A new SIP dial peer is configured for a third-party application that supports only an in-band DTMF relay. Which command must an engineer execute on the dial peer?

  • A dtmf-relay sip-info
  • B no dtmf-relay sip-kpml
  • C dtmf-relay sip-notify
  • D dtmf-relay rtp-nte
Explanation

In-band DTMF keeps DTMF tones in the voice audio stream. A SIP dial peer intended for in-band tones must not use the configured sip-kpml out-of-band relay method, so no dtmf-relay sip-kpml is required. Cisco documentation identifies RTP-NTE, SIP NOTIFY, SIP KPML, and SIP INFO as relay methods, while in-band DTMF is used when no relay method is configured.

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