I am trying to configure some FXO ports (loop-start, non-DID) to accept incoming calls and route them to a specific DN when the router (2851) goes into SRST mode. I have the MGCP configuration up and running and the ports work under Call Manager operation. However, in SRST mode the incoming calls hear one ring, about 15 - 20 seconds of silence and then the call drops.
Obviously I am missing something in the configuration but I'm rather new to SRST configurations. I've tried the default-destination command to no avail. It seems that there may be some dial-peer configuration missing.
How should this be configured? Remember these are simple ring-in lines (no calling/called number information is available.)