I’ve got a bouncing T1 that causes dropped calls and momentary loss of internet. The message I see on Asterisk is “WARNING chan_zap.c: No D-channels available! Using Primary channel 24 as D-channel anyway!”
My logs show that message cropping up occasionally since a year ago. But it was just a few times a month. In June (as temperatures rose?) it got worse. We finally began to take notice on the 15th, when it started dropping our calls many times a day.
The Adtran gets a red light. The smartjack, unfortunately, is not near the other equipment. I had someone watch it once as the line dropped and he saw a yellow HCRC light flash once.
AT&T has tested their lines to hell and back and can find nothing. We’ve replaced the Adtran, the smartjack, and the line between the two.
I’m running a VS1 with Asterisk 1.2 and a TE110P.
Could this be caused by my VS1? If so, what can I do or test?
Has anyone else had similar experience, where the phone company was unable to find problems with their lines? What was the cause and eventual resolution?