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 rtp-nte
B. dtmf-relay cisco-rtp
C. dtmf-relay h245-signal
D. dtmf-relay sip-kpml
