Which configuration should be added to the outgoing dial peer to resolve this issue?

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When a third-party SIP Phone System is dialed inbound across a Cisco Unified Border Element, DTMF is failing. The third-party vendor accepts only out-of-band DTMF .

Which configuration should be added to the outgoing dial peer to resolve this issue?
A . dtmf-relay h245-signal
B . dtmf-relay rtp-nte
C . dtmf-relay cisco-rtp
D . dtmf-relay sip-kpml

Answer: D