Quick Start Guide

Survivable Remote Site Telephony Overview
If communication between your phone and the Cisco Unified Communications Server 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. This failover is the Survivable Remote Site Telephony (SRST) feature.
While in failover, not all the features of your phone are available. The following table describes typical feature
and feature availability, although not all the features may be supported on your phone . For more information
about feature availability during failover, contact your system administrator.
SRST does not support IPv6.Note
Table 1: Feature Support During Failover
NotesSupportedFeature
YesNew Call
YesEnd Call
YesRedial
YesAnswer
YesHold
YesResume
YesConference
The Active Calls softkey does not
display.
NoConference to Active Calls (Join)
NoConference List
YesTransfer
NoTransfer to Active Calls (Direct
Transfer)
YesAuto Answer
YesCall Waiting
YesCaller ID
YesAudible Message Waiting Indicator
Cisco IP Phone 8811, 8841, 8851, and 8861 User Guide for Cisco Unified Communications Manager 10.5
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Advanced Operations
Survivable Remote Site Telephony Overview