Cisco
300-085 · Question #209
300-085 Question #209: Real Exam Question with Answer & Explanation
The correct answer is A: dtmf-relay sip-notify. DTMF tones from the caller are not reaching Cisco Unity Express because the SIPv2 dial-peer is missing the dtmf-relay command. Adding dtmf-relay sip-notify instructs the router to signal key presses out-of-band via SIP NOTIFY messages, which CUE requires.
Cisco Unity Connection
Question
A user has reported that keys that are pressed when accessing Cisco Unity Express are not being acknowledged by the system. This configuration is found on the voice-enabled IOS router: dial-peer voice 6800 voipdestination-pattern 5...session protocol sipv2session target ipv4:10.3.6.127codec g711ulawno vad What is the configuration command that is needed to complete the configuration and solve the problem?
Options
- Adtmf-relay sip-notify
- Bdtmf-relay rtp-nte
- Cdtmf-relay cisco-rtp
- Ddtmf-relay h245-signal
Explanation
DTMF tones from the caller are not reaching Cisco Unity Express because the SIPv2 dial-peer is missing the dtmf-relay command. Adding dtmf-relay sip-notify instructs the router to signal key presses out-of-band via SIP NOTIFY messages, which CUE requires.
Common mistakes.
- B. dtmf-relay rtp-nte (RFC 2833) transmits DTMF over RTP Named Telephony Events, which Cisco Unity Express does not support as its in-band DTMF detection method on SIP dial-peers.
- C. dtmf-relay cisco-rtp is a Cisco-proprietary RTP extension not recognized or supported by Cisco Unity Express for DTMF signaling.
- D. dtmf-relay h245-signal is specific to H.323 call signaling and cannot be used on a dial-peer configured with session protocol sipv2.
Concept tested. DTMF relay method for SIP dial-peer to CUE
Topics
#DTMF relay#SIP dial-peer#Cisco Unity Express#sip-notify
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