The H.248 link connects a Communication Manager server and a gateway. The H.323 link connects ties a gateway and an H.323-compliant IP endpoint. Link recovery is an automated method that the gateway uses to reacquire a lost link. The link might be lost from either a primary call controller or a Survivable Remote server. The H.248 link and the H.323 link provide the signaling protocol for:
When the link is out of service, link recovery preserves calls and attempts to reestablish the original link. If the gateway or the endpoint cannot reconnect to the original server or gateway, then link recovery automatically attempts to connect with alternate TN799DP (PROCR) circuit packs. Link recovery only connects with circuit packs that are within the configuration of the original server or the Survivable Remote server.
