Specifications

Failover ShoreWare Server Release Notes
Page 88
IP Phone Calls Continue Through Failover
Feature Description
The IP Phone Calls Continue Through Failover feature maintains active calls through the
normal completion of the call even when the call manager switch handling the call
becomes unavailable.
Background
When a phone’s call manager switch becomes unavailable during a call while IP Phone
Failover is enabled, the phone goes through two failover stages:
• Pending Failover is the period between when the phone does not receive the expected
acknowledgement signal from its call manager switch until the time that an alternate
switch is assigned to perform call manager tasks for the phone. This period typically
lasts between two to four minutes after the switch becomes unavailable.
• Failover is the period after the alternate switch is assigned to perform call manager
tasks for the phone.
IP Phone Failover is enabled from the IP Phones Options edit panel, as shown in Figure 34.
Legacy Behavior
When a phone enters the Pending Failover stage, calls in progress remain active. Call
control options, including softkey operation, are unavailable during this time. Users cannot
initiate new calls and the phone display remains frozen during Pending Failover.
In previous ShoreTel versions, all active calls are dropped when the phone enters the
Failover stage. The phone then resumes normal operation, allowing the user to initiate or
receive calls and perform call control actions on new calls.
Feature Definition
IP Phone Calls Continue Through Failover feature maintains active calls through the
beginning of the Failover stage until the normal completion of the call. All Pending Failover
restrictions remain in place after the phone enters the Failover stage until calls maintained
through Failover initiation are completed.
This feature is applicable to ShorePhones, SIP extensions, and Conference Bridges.
SoftPhone does not support continuation of calls through failover.
Figure 34 Enabling IP Phone Failover