Calls from Asterisk->UAX offline

To quote todays diary entry from http://dfrtelecoms.org.uk/diary15.htm

December 19: Peter came in today to find an alarm from Lydney Signal Box. Rick and I met him at the box. It was a low volt alarm caused by a junction held permanently. This had the ringer running continuously. The volts were down to 29 when we arrived. Disconnecting the junction cleared the fault and stopped the ringer. The battery voltage started to rise slowly. Hopefully it will all be OK. Back at Norchard we found the Asterisk holding the connection. We don’t know why, the circuits from the Asterisk have been pegged out and the problem referred to Paul.

As a result, calls from the Asterisk to the internal phones at the railway are offline. (This includes calls connected from the sipgate number)

This problem seems to have started since we moved the FXO ports on the Asterisk from being directly connected to an incoming selector on the UAX, to being connected to a pair of line circuits.

I can’t get to site to do any direct investigation (and I can’t get to my copy of Atkinson to do any diagram based theorising because it’s all packed up for some decorating work) but I suspect something is behaving differently from an electrical point of view.

I have a hunch it might be related to line reversals on called-sub-answer, but I need to check that before I can make any changes or recommend that we reconnect the circuits.

Watch this space…