Configuring DTMF Relay on Cisco Unified Border Element

Where is the dtmf-relay command configured on Cisco Unified Border Element?

Question

Where is the dtmf-relay command configured on Cisco Unified Border Element?

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Explanations

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A. B. C. D.

B.

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/cube/configuration/cube-book/dtmf-relay.html

The DTMF-relay command is used to configure Dual-tone multi-frequency (DTMF) relay on a Cisco Unified Border Element (CUBE). DTMF relay is a mechanism that enables DTMF tones to be passed transparently across IP networks, thereby allowing users to send and receive DTMF tones during a phone call. The configuration of the DTMF-relay command on a CUBE depends on the call control protocol being used.

Here are the possible locations where the dtmf-relay command can be configured on a Cisco Unified Border Element:

A. In the voice-class VoIP configuration: If the CUBE is using H.323 as the call control protocol, then the dtmf-relay command can be configured in the voice-class VoIP configuration. The command used to configure DTMF-relay in the voice-class VoIP configuration is "dtmf-relay h245-alphanumeric".

B. In the VoIP dial peer: If the CUBE is using Session Initiation Protocol (SIP) as the call control protocol, then the dtmf-relay command can be configured in the VoIP dial peer. The command used to configure DTMF-relay in the VoIP dial peer is "dtmf-relay rtp-nte" or "dtmf-relay sip-kpml".

C. In global SIP configuration: In some cases, the dtmf-relay command can be configured in the global SIP configuration on a CUBE. This is applicable when you want to apply the same DTMF-relay configuration to all SIP dial peers on the CUBE. The command used to configure DTMF-relay in the global SIP configuration is "voice service voip > sip > dtmf-relay".

D. In the VoIP or POTS dial peers: In addition to SIP dial peers, the dtmf-relay command can also be configured in VoIP or Plain Old Telephone Service (POTS) dial peers on a CUBE. The command used to configure DTMF-relay in the VoIP or POTS dial peer is "dtmf-relay rtp-nte" or "dtmf-relay sip-kpml".

In summary, the location where the dtmf-relay command is configured on a Cisco Unified Border Element depends on the call control protocol being used and can be either in the voice-class VoIP configuration, the VoIP or POTS dial peers, or in the global SIP configuration.