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1. Phone Features

Chapter 40

Cisco IP Phones

Phone Failover and Fallback

This section describes how phones fail over and fail back if the

Cisco 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 CallManager Fails or Becomes Unreachable

The active Cisco CallManager designation applies to the Cisco CallManager from

which the phone receives call-processing services. The active Cisco CallManager

usually serves as the primary Cisco CallManager for that phone (unless the

primary is not available).

If the active Cisco CallManager fails or becomes unreachable, the phone attempts

to register with the next available Cisco CallManager in the Cisco CallManager

Group that is specified for the device pool to which the phone belongs.

The phone device reregisters with the primary Cisco CallManager as soon as it

becomes available after a failure. See the

"MaxPhonesFallBackQueueDepth

Service Parameter" section on page 40-45

for information about phone

registration during failover.

Phones do not failover or fallback 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.

Cisco CallManager System Guide

40-47

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