In survivable mode, SLS provides only a limited subset of CM call processing functionality:
Limited call routing through a Survivable ARS Analysis Table (through the CLI) and COR calling permissions
Inbound calls are directed in one of three ways:
Using the Incoming-Routing screen
Using the Set Incoming-Destination on the Trunk group screen that enables mapping to a given station
Inbound calls are directed to a previously-administered pool of available stations (the Survivable Trunk Dest? field is y on the Station screen). The search algorithm is circular so that the incoming calls are fairly distributed.
Important:
SLS permits 911 calls, but the specific location information is not transmitted to the Public Service Answering Point (PSAP). Only the general trunk-identifying information is transmitted. Emergency personnel will have a general location associated with the trunk (for example, a building address), but nothing more specific (for example, a room or office number). Also, if a 911 call disconnects for any reason, emergency personnel cannot reliably call the originator back. A small business office’s address is sufficient from the perspective of emergency routing.
CM Feature Access Codes for ARS, contact closure, and Hold
Acts as an H.323 Gatekeeper that enables IP endpoints to register simultaneously
Direct Inward Dialing
Multiple call appearances
Hold and Call Transfer functions
Contact closure feature
Call Detail Recording (CDR)
Trunk Access Code (TAC) dialing
Non-ISDN DS1 trunks (with in-band signaling)
ISDN PRI/BRI trunks:
