We have 5 remote branches that are configured each with their own PRI and a PIP to the main site via MPLS.
Each branch has it's own 800 and local number for that area.
I am told that each branch is configured for SRST.
I do not understand exactly what is happening and what is supposed to happen.
When I do a debug on the remote site router, I can see the inbound call come in to the router, but I am not sure what happens after that.
I see the call manager (located at the main site)is configured in the router also, but what happens when the call manager cannot be reached for example when the MPLS link is down?
I do not see anything in the config that would have the router directing inbound calls to handsets in the remote branches (when we loose MPLS remote site phone do not work).
What is the SRST doing?