Survivable Remote Site Telephony Overview
If communication between your phone and the Cisco Unified Communications Manager is interrupted, you
receive an alert message on your phone. If you are on an active call, the call remains established, and you
enter a failover situation. The Survivable Remote Site Telephony (SRST) feature handles this failover.
While in failover, all the features of your phone are not available. The following table describes typical feature
and feature availability, although not all the features may be supported on your phone. For more information,
contact your system administrator.
When your phone loses connectivity, your phone may display a message like this:
Service interruption.
Table 3: Feature Support During Failover
NotesSupportedFeature
YesNew Call
YesEnd Call
YesRedial
YesAnswer
YesHold
YesResume
The support is only for three way
and local mixing.
YesConference
NoConference to Active Calls (Join)
NoConference List
Consult onlyYesTransfer
NoTransfer to Active Calls (Direct
Transfer)
YesAuto Answer
YesCall Waiting
YesCaller ID
YesAudible Message Waiting Indicator
Cisco IP Phone 7811, 7821, 7841, and 7861 User Guide for Cisco Unified Communications Manager 10.0 (SIP)
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Advanced Operations
Survivable Remote Site Telephony Overview
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