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Cisco Unified CallManager System Guide
OL-14153-01
Chapter 43 Cisco Unified IP Phones
Phone Failover and Fallback
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 “Maximum Phone Fallback Queue Depth Service Parameter” section on
page 43-30 for information about phone registration during failover.
Note Phones do not fail over or fall back while a call is in progress.
Phone is Reset
If a call is in progress, the phone does not reset until the call finishes.
Phone Configuration Checklist
Table 43-5 provides steps to manually configure an SCCP phone in Cisco Unified CallManager
Administration. If you are using autoregistration, Cisco Unified CallManager adds the phone and
automatically assigns the directory number.
Table 43-6 provides steps to manually configure a SIP phone in Cisco Unified CallManager
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 Procedures and Related Topics
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
Phone Search, page 43-27
Step 2
Add and configure the phone. Configuring Cisco Unified IP Phones, Cisco
Unified CallManager Administration Guide