Features Page 89 of 910
IP Line Description, Installation and Maintenance
on hold, this means the held calls cannot be retrieved until after the firmware
download is finished.
Voice Gateway Media Cards
The ACF feature does not handle failures of the Voice Gateway functionality
of the Voice Gateway Media Cards.
ELAN and TLAN subnet failures that affect the signaling with the IP Phones
registered to a Voice Gateway Media Card are addressed in the same manner
as failures affecting the Signaling Server. However, if there is a failure
affecting the speech path to an IP Phone, such as when a PBX link failure
occurs and the 10-minute PBX link timer expires, the Voice Gateway calls are
released.
Codecs
Not all the codec properties are restored for the failed-over call. The
following default codec properties are used for the active failover call:
• VAD is OFF
• G.723 Working Rate is 5.3 kbps
• G.729 Annex is Annex A
QoS monitoring
The QoS monitoring is always disabled for the failover call. This is only for
the period of the failover call; for all subsequent calls, the QoS monitoring
works as configured.
Virtual Office
Active Call Failover is not supported for the active call from an IP Phone
logged on another IP Phone to a TDM resource or virtual trunk. Such a call is
released when the LTPS detects that the connection to the IP Phone is lost.
For example, IP Phone A is logged on to IP Phone B and talking to a TDM
resource or a virtual trunk. If a TLAN subnet failure occurs and IP Phone A
reregisters with its home TN, the active call is released as IP Phone A
reregisters.