350-801 · Question #396
A Cisco voice gateway is configured to use a sip-kpml DTMF relay in global settings. A new SIP dial peer is configured for a third-party application that only supports an in-band DTMF relay. Which…
The correct answer is C. dtmf-relay rtp-net. To configure a specific SIP dial peer to use in-band DTMF relay when the global setting is sip-kpml, the engineer must apply the dtmf-relay rtp-net command to that dial peer.
Question
A Cisco voice gateway is configured to use a sip-kpml DTMF relay in global settings. A new SIP dial peer is configured for a third-party application that only supports an in-band DTMF relay. Which commands must an engineer run on the dial peer?
Options
- Adtmf-relay sip-info
- Bdtmf-relay sip-notify
- Cdtmf-relay rtp-net
- Dno dtmf-relay sip-kpml
How the community answered
(30 responses)- A17% (5)
- B3% (1)
- C73% (22)
- D7% (2)
Why each option
To configure a specific SIP dial peer to use in-band DTMF relay when the global setting is `sip-kpml`, the engineer must apply the `dtmf-relay rtp-net` command to that dial peer.
`dtmf-relay sip-info` is an out-of-band DTMF relay method, which would not satisfy the requirement for an in-band solution.
`dtmf-relay sip-notify` is an out-of-band DTMF relay method and therefore would not meet the requirement for in-band DTMF.
The `dtmf-relay rtp-net` command configures the specific SIP dial peer to use RFC 2833 (RTP Named Telephone Events), which is an in-band DTMF relay method, thereby overriding the global `sip-kpml` setting for that particular peer.
While `no dtmf-relay sip-kpml` would remove the `sip-kpml` setting from the dial peer, it does not actively configure the required `rtp-net` (in-band) method.
Concept tested: Cisco Voice Gateway DTMF relay configuration
Source: https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/vg/vg_pvdms2/configuration/guide/vg_pvdms2_c.html
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