Features Page 91 of 910
IP Line Description, Installation and Maintenance
Virtual Office
It is possible that active IP Phone A, that was logged into IP Phone B before
the failure, cannot reregister with the Call Server, because IP Phone C
performed a Virtual Office login and uses IP Phone A’s TN. In this case, the
Signaling Server/Voice Gateway Media Card locally handles the Release,
Onhook and Mute events coming from IP Phone A in the Logged Out state.
Survivable Remote Gateway
The Survivable Remote Gateway (SRG) 1.0 and SRG50 do not support ACF.
If the IP Phone is an SRG user, the active call, either in normal mode or local
mode, does not survive a failure.
NAT
The NAT discovery is delayed for an IP Phone with an active call when it
reregisters. NAT discovery messages are sent through the port used for the
RTP stream. NAT discovery is not initiated if the LTPS detects that the IP
Phone has an active RTP stream.
Personal Directory, Callers List, Redial List
The display content is cleared and the Personal Directory/Callers List/Redial
List applications are reset when the active call failover process starts. The
applications can be used again only after the IP Phone reregisters. A user that
is using one of the Personal Directory/Callers List/Redial List menus sees the
display clear and loses any data in that transaction that was not selected or
saved with the Personal Directory/Callers List/Redial List feature.
ACF implementation does not maintain data present only on the Signaling
Server/Voice Gateway Media Card. Transient data (for example, the Services
key sub-menu the user is currently in) is lost when the failover occurs and the
IP Phone reregisters.
Converged Desktop
If the Call Server maintains the active call information during the active call
failover, and the SIP Gateway maintains the link and information with the
MCS 5100 (the SIP Gateway has not failed or is not on the Signaling Server
that reboots if that is the failure mode), then a Converged Desktop call is
maintained when the involved IP Phone reregisters to the system. If the Call