Specifications

Appendix A: Preparing Cisco Unified SRST Support for SIP
DTMF Relay for SIP Applications and Voice Mail
183
Cisco Unified Survivable Remote Site Telephony Version 4.0 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 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
Step 3
exit
Example:
Router(config-dial-peer)# exit
Exits dial-peer configuration mode.
Step 4
sip-ua
Example:
Router(config)# sip-ua
Enables SIP user-agent configuration mode.
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