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

Question

Options

• Ain the voice-class VoIP configuration
• Bin the VoIP dial peer
• Cin global SIP configuration
• Din the VoIP or POTS dial peers

• A
  5% (1)
• B
  10% (2)
• C
  5% (1)
• D
  81% (17)

Explanation

dtmf-relay is a dial-peer level command, and it applies to both VoIP and POTS dial peers on CUBE - making D the most complete answer. On the inbound side a POTS dial peer may handle the call leg, and on the outbound side a VoIP dial peer carries it; DTMF relay can be tuned on either leg depending on where tone translation or signaling conversion is needed.

Why the distractors are wrong:

• A (voice-class VoIP): This is a reusable template that gets applied to dial peers, but dtmf-relay itself is not a valid command inside a voice-class VoIP stanza.
• B (VoIP dial peer only): Partially true but incomplete - limiting it to VoIP peers misses the POTS peer scenario, which is a common exam trap.
• C (global SIP configuration): Global SIP (sip-ua or voice service voip > sip) handles things like registrar, timers, and codec options - not per-call DTMF relay behavior.

Memory tip: Think "DTMF is a dial-peer decision" - you're deciding per-peer how tones travel (RFC 2833/RTP-NTE, SIP-INFO, inband, etc.), so the command always lives on a dial peer, not globally. If you see a distractor that names only one peer type, remember CUBE bridges two legs and either leg might need it.

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