Cisco Unified Callmanager Options - Cisco 3951 Administration Manual

Chapter 4 Configuring Settings on the Cisco Unified IP Phone

Cisco Unified CallManager Options

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The CallManager 1 through CallManager 5 options on the Network configuration
menu show the host names or IP addresses, in prioritized order, of the Cisco
Unified CallManager servers that the phone can register to. These options show
Cisco Unified CallManager servers that are available for processing calls from the
phone, in prioritized order.
For an available server, an option will show the Cisco Unified CallManager server
IP address and one of the following states:
Active—Cisco Unified CallManager server from which the phone is
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currently receiving call-processing services.
Standby—Cisco Unified CallManager server to which the phone switches if
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the current server becomes unavailable.
Blank—No current connection to this Cisco Unified CallManager server.
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An option may also include using CallManager 4 and CallManager 5 as one of
these designations:
SRST—Indicates Survivable Remote Site Telephony (SRST) designation,
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which indicates an SRST router capable of providing Cisco Unified
CallManager functionality with a limited feature set. This router assumes
control of call processing if all other Cisco Unified CallManager servers
become unreachable. The SRST Cisco Unified CallManager always appears
last in the list of servers, even if it is active.
After a failover to a SRST router, the phone will monitor the links to the
Note
Cisco Unified CallManager servers that the phone can register to. When
a server has been available for two minutes, by default, the phone will fall
back from the router to that server. You can change this default time by
specifying another value for the Connection Monitor Duration parameter
in Cisco Unified CallManager Administration. For more information,
refer to Cisco Unified CallManager Administration Guide.
TFTP designation—Indicates that the phone was unable to register with a
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Cisco Unified CallManager listed in its configuration file and it registered
with the TFTP server instead.
Cisco Unified SIP Phone 3951 Administration Guide for Cisco Unified CallManager 5.1
Configuration Menus on the Cisco Unified IP Phone
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