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This is a strange situation. Make sure none of the ports are in TEST mode. I suggest pulling and re-seating the FXS modules.
If you hear dial tone, then that is coming from the switch, as the TA 750 doesn't provide dial tone. It is simply a channel bank. When dialing, the phone is producing the DTMF tones, and the TA 750 is simply passing it along the channel (DS0) on the T1. Are you able to get a T-Bert connected to the T1 and verify you can dial out using that?
You can go into the TEST mode of the FXS module and generate a 1 KHz tone in "both directions" and see if that is detected at the switch, as well as on a phone or butt-set off the FXS port.
(When you disable the test, you should re-seat the FXS module again to ensure the test gets canceled.)
Hope this helps,
Thank you Patrick,
We have done all the checks as you mentioned, the problem goes away when we reseat all the cards... it eventually comes back again. We have checked the grounds, swapped the chasis and some of the cards... we have another channel bank on a separate T1 that we have slowly moved customers to and once an FXS card slot is "empty" then we remove the card to see if the problem comes back or goes away.. Still testing, we will see how things go. I appreciate your help!
Also, make sure the Firmware on the BCU is up to date. I don't recall any issues like this, but the product is pretty old.
The latest version released was L.38.