My T1 is broken into 24 analog channels through a Zhone 10-plex with 24 FXS channels.

2 of the channels just stopped working - no dial tone.

This is a new installation where I had to supply the channelbank. Luckily, it worked with all the default settings as I could not find anyone to install it. (24 channels is a rare setup in Canada as it was disallowed until recently. It doesn't help that the Channelbank is obsolescent.)

Now this and I have no clue how to troubleshoot. All the settings I've checked are OK but I don't know if I've missed anything. Commands are via CLI which I access with Hyperterminal.