Specifications

Appendix A: Preparing Cisco SRST Support for SIP
DTMF Relay for SIP Applications and Voice Mail
157
Cisco IOS Survivable Remote Site Telephony Version 3.4 System Administrator Guide
Troubleshooting Tips
The dial-peer section of the show running-config command output displays DTMF relay status when it
is configured, as shown in this excerpt:
dial-peer voice 123 voip
destination-pattern [12]...
monitor probe icmp-ping
session protocol sipv2
session target ipv4:10.8.17.42
dtmf-relay rtp-nte
DTMF Relay Using SIP Notify (Nonstandard)
To use voice mail on a SIP network that connects to a Cisco Unity Express (CUE) system, use a
nonstandard SIP Notify format. To configure the Notify format, use the sip-notify keyword with the
dtmf-relay command. Using the sip-notify keyword may be required for backward compatibility with
Cisco SRST Versions 3.0 and 3.1.
SUMMARY STEPS
1. dial-peer voice tag voip
2. dtmf-relay sip-notify
3. exit
4. sip-ua
5. notify telephone-event max-duration time
6. exit
Step 5
notify telephone-event max-duration time
Example:
Router(config-sip-ua)# notify telephone-event
max-duration 2000
Configures the maximum time interval allowed
between two consecutive NOTIFY messages for a
single DTMF event.
• max-duration time—Time interval between
consecutive NOTIFY messages for a single
DTMF event, in milliseconds. Range is from
500 to 3000. Default is 2000.
Step 6
exit
Example:
Router(config-sip-ua)# exit
Exits SIP user-agent configuration mode.
Command or Action Purpose