Instruction manual

Networking and connectivity
555-233-767124 Issue 4 May 2003
IP Port Network Connectivity (PNC)
Communication Manager allows Control Channel Message Set (CCMS)
messages to be packetized over IP LAN and WAN connections to control multiple
port networks.
Link recovery
IP calls must have an H.248 link between the Avaya G700 Media Gateway and the
call controller. The H.248 link between an Avaya server running Communication
Manager and the Avaya Media Gateway provides the signaling protocol for:
■ Call setup
■ Call control (user actions such as Hold, Conference, or Transfer) while the
call is in progress
■ Call tear-down
If the link fails for any reason, Link Recovery preserves any existing calls and
attempts to re-establish the original link. If the gateway cannot reconnect to the
original server, then Link Recovery automatically attempts to connect with
alternate TN799DP (C-LAN) circuit packs within the original server’s
configuration or to a Local Spare Processor (LSP).
Link Recovery does not attempt to recover or overcome any network failure that
created the link outage. Link Recovery also does not diagnose or repair the
network failure that caused the link outage.
Since there is no communication possible between the Media Gateway and call
controller during a link outage, button depressions are not recognized, feature
access does not work, and neither does any other type of call handling. In essence,
the system is unresponsive to any stimuli until the H.248 link is restored. This
might be the only indication that link recovery is in process.
!
CAUTION:
If anyone attempts to add a station (phone) to a gateway while that gateway
is in Link Recovery, that station is not put into service when the gateway
comes back. If this happens, perform a busyout/release command on
that station when the gateway comes back into service.