We are evaluating deploying ER. We have a main campus with several remote locations and ER would be a great fit. However, I'm concerced as to what happens if the connection to ER is lost. I.e. either a WAN or server failure. What would happen if someone dialed 911 and the ER server was not availible?
Your questions regarding ER are excellent ones, and certainly need to be addressed before moving forward. I have been looking at ER for our Campus and have been doing some reading.It looks like the ER servers can be clustered for redundancy and that remote offices can be serviced for 911 calls a variety of ways.It seems that with the proper planning, there are many ways to mitigate the possibility of problems.This is also one instance that engaging your Cisco SE and Cisco product developement is really a great idea. Have a look at the following docs:
Deploying Cisco Emergency Responder In One Main Site with Satellite Offices
Cisco Emergency Responder (Cisco ER) configuration if you have one main site that serves one or more satellite offices, that is, where the phones in the satellite office are run from the Cisco CallManager cluster on the main site.
Caution In this configuration, if the WAN link between the offices goes down, the people in the satellite office cannot make emergency calls.
If the satellite office is small (fewer than 50 phones) and you are using survivable remote site telephony (SRST), it is probably easier to support emergency calls directly by configuring the gateway in the remote office to send 911 calls to an FXO port that has a CAMA trunk to the local PSAP rather than to Cisco ER in the main office.
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