Avaya Nortel Communication Server 1000 Manual page 59

IP/IP calls means both parties are IP Phones. IP/TDM calls means one
party is an IP Phone and the other party is a TDM telephone or trunk.
•
The IP/TDM call does not survive if the Voice Gateway Media Card with the
DSP resource used for the call fails.
•
•
IP Phone to IP Phone calls survive the Call Server failures listed above.
IP Phone to Media Gateway calls through IP Peer virtual trunk routes are
preserved on the TDM side of the Media Gateway, in some cases, when the IP
Phone is redirected in ACF mode from the main office CS 1000 to the MG 1000B
at the branch office location, or from the Geographic Redundancy Primary to the
Secondary Call Server.
IP Phone to Media Gateway calls are preserved if the Media Gateway to which
the call is established is not affected by the failure, or if there is cold restart of
the Call Server that controls the Media Gateway where the IP Peer virtual trunk
call is established.
•
When the IP Phone with an active call re-registers, the call data is rebuilt if
the Call Server does not know about the call, using the internal IP Phone
information.
The ACF feature for IP Phones meets Joint Interoperability Test Command
(JITC) requirements if the LAN/WAN network is engineered to provide full
redundancy: that is, if a LAN/WAN network component fails, an alternate
path between the clients and LTPS server is provided.
Copyright © 2003–2008, Nortel Networks
.
IP and IP/TDM calls survive Signaling Server restarts.
IP and IP/TDM calls survive LTPS ELAN subnet failures.
IP calls survive a Call Server cold start and Call Server failures in system
configurations with a redundant Call Server of the following types
— Media Gateway 1000B for a branch office configuration
— Geographic Redundancy Secondary Call Server. The feature
addresses the Primary Call Server failures.
For Call Server call processor types CP PII, CP PIV, and CP-PM:
— IP/IP calls survive a cold start on all systems.
— IP/IP and IP/TDM calls survive a warm start on all systems.
— Graceful switchover and graceful failover to the redundant Logical
Call Processor (LCP) side of the Call Server makes the failure
transparent and allows all the calls to survive without any loss.
Nortel Communication Server 1000
IP Line Fundamentals
NN43100-500 02.02 Standard
Release 5.5 4 February 2008
Active Call Failover for IP Phones 59
ATTENTION