This morning my DAHDI trunk has stopped and on checking everything seams ok.

Nothing has changed or been updated but the log is showing Alarm Cleared on channel 1 on a Sangoma A200 card.

Anybody seen this or any pointers.

10073[2021-04-06 14:57:17] NOTICE[2844] sig_analog.c: Alarm cleared on channel 1

10074[2021-04-06 14:57:27] VERBOSE[2844][C-00000007] sig_analog.c: Starting post polarity CID detection on channel 1

10075[2021-04-06 14:57:27] VERBOSE[7495][C-00000007] sig_analog.c: Starting simple switch on ‘DAHDI/1-1’

10076[2021-04-06 14:57:36] WARNING[7495][C-00000007] sig_analog.c: CID timed out waiting for ring. Exiting simple switch

10077[2021-04-06 14:57:36] VERBOSE[7495][C-00000007] sig_analog.c: Hanging up on ‘DAHDI/1-1’

10078[2021-04-06 14:57:36] VERBOSE[7495][C-00000007] chan_dahdi.c: Hungup ‘DAHDI/1-1’


That shows battery appearing on the fxo interface at 2021-04-06 14:57:17, this clears the alarm but is seen as a wink that given your config causes a failed but spurious CID detection.

You need to find out why there was no battery prior to 2021-04-06 14:57:17 , further having battery does not guarantee that the trunk will provide dialtone (be working)