Implementing Cisco Advanced Call Control and Mobility Services (CLACCM) — Question 104

An administrator is configuring a SIP trunk to an ITSP. The SIP connection will traverse from a Cisco UCM to the ISTP through a Cisco Unified Border Element. The ITSP has indicated that they require an in-band method for DTMF. Which command on the outbound dial-peer to the ITSP will meet this requirement?

Answer options

• A. router (config-dial-peer) dtmf-relay sip-notify
• B. router (config-dial-peer) dtmf-relay sip-kpml
• C. router (config-dial-peer) dtmf-relay h245-alphanumeric
• D. router (config-dial-peer) dtmf-relay rtp-nte

Correct answer: D

Explanation

The correct answer is D, as 'rtp-nte' specifies that DTMF tones are relayed in-band using RTP, which meets the ITSP's requirement for in-band DTMF. Options A and B use SIP-based methods that do not provide in-band DTMF, and option C refers to H.245 DTMF transmission, which is not applicable in this SIP context.