Specifications

ShoreWare Server Release Notes Failover
ShoreTel 9.1 Page 89
IP Phone Behavior during Failover
ShorePhone – Local Endpoint
During the Pending Failover stage, the telephone user interface (TUI) displays a No
Service message until the phone is assigned to a new switch. Call control operations are not
available on surviving calls. All inbound calls to the local endpoint are routed to the
destination specified by the current Call Handling Mode.
During the Failover stage, the TUI displays Failover Mode while surviving calls remain
active. Pressing phone keys generates a No Service message on the TUI. Call control
operations on surviving calls remain unavailable. All inbound calls to the local endpoint
are routed to the destination specified by the current Call Handling Mode. After all
surviving calls are concluded, the ShorePhone returns to normal operation.
ShorePhone – Remote Endpoint
ShorePhones on remote endpoints during failover calls can hang up the call, place the call
on hold, or retrieve the call from hold. All other softkey operations are unavailable for the
duration of the call. The ShorePhone continues displaying call information until the end of
the call. Call control operations on other calls remain available.
SIP Phones
This feature causes no changes to messages displayed by SIP devices. Failover procedures
and restrictions are applicable to SIP phones. Call control operations initiated from SIP
phones on failover calls are not available.
Trunk Behavior
ShoreTel only releases the trunk after the remote side goes on-hook. System cleanup
procedures, executed every two hours, release trunks that were left hanging.
Restrictions
Bandwidth cannot be reallocated on the failover switch.
Spare Switch Failover
Background
Prior to version 9, ShoreTel does not reserve switches exclusively for servicing phones
losing access to their call manager switch. Phones fail over to switches with available
resources that are assigned to the same site as the phone.
Effective use of IP Phone Failover requires sufficient excess switch capacity at each site for
reassigning call manager resources to phones having lost switch access.
Feature Description
Spare Switch Failover introduces spare switches for handling IP Phones that failover. Spare
switches are reserved for servicing IP Phones unable to access their call manager switch. A
spare switch is available at the site where it is configured and all descendants of that site.
A spare switch remains dormant until activated by a site. IP Phone failover processes within
a site are unaltered by this feature until a site has no remaining call manager resources for
assignment to failover devices. When an IP Phone initiates a failover when no switch