A user has reported that keys 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 voip
destination-pattern 5…
session protocol sipv2
session target ipv4:10.3.6.127
codec g711ulaw
no vad
Which configuration command is needed to complete the configuration and solve the problem?
A. dtmf-relay sip-notify
B. dtmf-relay rtp-nte
C. dtmf-relay cisco-rtp
D. dtmf-relay h245-signal
I think it is B, because for SIP NOTIFY you’d also require b2bua command
Nvm, it is A, Bob is correct.
Correct –> A
Enable DTMF Integration Using SIP NOTIFY
To configure a SIP dial peer to point to Cisco Unity Express and enable SIP dual-tone multi-frequency (DTMF) relay using SIP NOTIFY format, follow the steps in this task.
*** Note that for pointing to Cisco Unity it would be dtmf-relay rtp-nte ***
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucme/admin/configuration/manual/cmeadm/cmevmail.html#configuration-examples