Enable Parameters; Triggers; Resync At Specific Intervals - Cisco 8800 Series Manual

Cisco IP Phone Provisioning

Enable Parameters

The Provision_Enable and Upgrade_Enable parameters control all profile resync and firmware upgrade
operations. These parameters control resyncs and upgrades independently of each other. These parameters
also control resync and upgrade URL commands that are issued through the administration web server. Both
of these parameters are set to Yes by default.
The Resync_From_SIP parameter controls requests for resync operations. A SIP NOTIFY event is sent from
the service provider proxy server to the phone. If enabled, the proxy can request a resync. To do so, the proxy
sends a SIP NOTIFY message that contains the Event: resync header to the device.
The device challenges the request with a 401 response (authorization refused for used credentials). The device
expects an authenticated subsequent request before it honors the resync request from the proxy. The Event:
reboot_now and Event: restart_now headers perform cold and warm restarts, respectively, which are also
challenged.
The two remaining enables are Resync_On_Reset and Resync_After_Upgrade_Attempt. These parameters
determine whether the device performs a resync operation after power-up software reboots and after each
upgrade attempt.
When Resync_On_Reset is enabled, the device introduces a random delay that follows the boot-up sequence
before the reset is performed. The delay is a random time up to the value that the Resync_Random_Delay (in
seconds) specifies. In a pool of phones that power up simultaneously, this delay spreads out the start times of
the resync requests from each unit. This feature can be useful in a large residential deployment, in the case
of a regional power failure.

Triggers

The phone allows you to resync at specific intervals or at a specific time.

Resync at Specific Intervals

The phone is designed to resync with the provisioning server periodically. The resync interval is configured
in Resync_Periodic (seconds). If this value is left empty, the device does not resync periodically.
The resync typically takes place when the voice lines are idle. If a voice line is active when a resync is due,
the phone delays the resync procedure until the line becomes idle again. A resync can cause configuration
parameter values to change.
A resync operation can fail because the phone is unable to retrieve a profile from the server, the downloaded
file is corrupt, or an internal error occurred. The device tries to resync again after a time that is specified in
Resync_Error_Retry_Delay (seconds). If Resync_Error_Retry_Delay is set to 0, the device does not try to
resync again after a failed resync attempt.
If an upgrade fails, a retry is performed after Upgrade_Error_Retry_Delay seconds.
Two configurable parameters are available to conditionally trigger a resync: Resync_Trigger_1 and
Resync_Trigger_2. Each parameter can be programmed with a conditional expression that undergoes macro
expansion. When the resync interval expires (time for the next resync) the triggers, if set, will prevent resync
unless one or more triggers evaluates to true.
The following example condition triggers a resync. In the example, the last phone upgrade attempt has elapsed
more than 5 minutes (300 seconds), and at least 10 minutes (600 seconds) have elapsed since the last resync
attempt.
Cisco IP Phone 8800 Series Multiplatform Phone Administration Guide for Release 11.3(1) and Later
Enable Parameters
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