We’re having a problem with zaptel randomly dying on us. Everything works fine for a couple weeks or so, and then for no apparent reason nobody will be able to dial in or out - sip continues to work normally.
Each failure coincides with the following message showing up in the system log:
kernel: zaptel Disabled echo canceller because of tone (rx) on channel 1
From what I understand, these messages are normal; zaptel is detecting an incoming fax and has disabled echo cancellation. But it’s happened too often to be a coincidence, imho.
I’ve tried running ztcfg -vv after it stops working but it returns normal results; no error messages, and there is nothing else abnormal in the system log.
We are using a TDM800P with 4 analog lines. Asterisk version 1.4.15 , zaptel-1.4.7.
Please let me know if I can provide any other info. Thanks.