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Chapter 43
Cisco Unified IP Phones

Phone Failover and Fallback

This section describes how phones fail over and fall back if the Cisco Unified CallManager to which they
are registered becomes unreachable. This section also covers conditions that can affect calls that are
associated with a phone, such as reset or restart.
Cisco Unified CallManager Fails or Becomes Unreachable
The active Cisco Unified CallManager designation applies to the Cisco Unified CallManager from which
the phone receives call-processing services. The active Cisco Unified CallManager usually serves as the
primary Cisco Unified CallManager for that phone (unless the primary machine is not available).
If the active Cisco Unified CallManager fails or becomes unreachable, the phone attempts to register
with the next available Cisco Unified CallManager in the Cisco Unified CallManager Group that is
specified for the device pool to which the phone belongs.
The phone device reregisters with the primary Cisco Unified CallManager as soon as it becomes
available after a failure. See the
page 43-30
Phones do not fail over or fall back while a call is in progress.
Note
Phone is Reset
If a call is in progress, the phone does not reset until the call finishes.

Phone Configuration Checklist

Table 43-5
Administration. If you are using autoregistration, Cisco Unified CallManager adds the phone and
automatically assigns the directory number.
Table 43-6
Administration. If you are using autoregistration, Cisco Unified CallManager adds the phone and
automatically assigns the directory number.
Table 43-5
Phone Configuration Checklist for SCCP Protocol
Configuration Steps
Step 1
Gather the following information about the phone:
•
Model
•
MAC address
•
Physical location of the phone
Cisco Unified CallManager user to associate with the phone
•
Partition, calling search space, and location information, if
•
used
•
Number of lines and associated DNs to assign to the phone
Step 2
Add and configure the phone.
OL-14153-01
"Maximum Phone Fallback Queue Depth Service Parameter" section on
for information about phone registration during failover.
provides steps to manually configure an SCCP phone in Cisco Unified CallManager
provides steps to manually configure a SIP phone in Cisco Unified CallManager
Phone Failover and Fallback
Procedures and Related Topics
Phone Search, page 43-27
Configuring Cisco Unified IP
Unified CallManager Administration Guide
Cisco Unified CallManager System Guide
Phones, Cisco
43-31