Cisco Unified Survivable Remote Site Telephony Feature Roadmap
Information About New Features in Cisco Unified SRST
51
Cisco Unified SCCP and SIP SRST System Administrator Guide
OL-13143-04
No Timeout for Call Preservation
To preserve existing H.323 calls on the branch in the event of an outage, disable the H.225 keepalive
timer by entering the
no h225 timeout keepalive
command. This feature is supported in Cisco IOS
Releases 12.3(7)T1 and higher versions. See the
“Cisco Unified SCCP and SIP SRST Feature Overview”
section on page 11
for more information.
H.323 is not supported with SIP phones.
RFC 2833 DTMF Relay Support
Cisco Skinny Client Control Protocol (SCCP) phones, such as those used with Cisco SRST systems,
provide only out-of-band DTMF digit indications. To enable SCCP phones to send digit information to
remote SIP-based IVR and voice-mail applications, Cisco SRST 3.2 and later versions provide
conversion from the out-of-band SCCP digit indication to the SIP standard for DTMF relay, which is
RFC 2833. You select this method in the SIP VoIP dial peer using the
dtmf-relay rtp-nte
command. See
the
“How to Configure DTMF Relay for SIP Applications and Voice Mail” section on page 252
for
configuration instructions.
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.
Translation Profile Support
Cisco SRST 3.2 and later versions support translation profiles. Translation profiles allow you to group
translation rules together and to associate translation rules with the following:
•
Called numbers
•
Calling numbers
•
Redirected called numbers
See the
“Enabling Translation Profiles” section on page 140
for more configuration information. For
more information on the
translation-profile
command, see
Cisco Unified SRST and Cisco Unified SIP SRST Command Reference (All Versions).