[Asterisk-Users] TDM400P FXO channel remains Offhook after outoing or incoming call / line is parallel with other telephone equipment

[Rich Adamson]

> Thank you for your  answer. Now I've figured that one of the FXO modules 
> on the card may be defective. Whenever I plug in telco line in it - that 
> line will be like shortened (if you pick up parallel telephone, the dial 
> tone will be heard weaker than usually). So the FXO module is always in 
> Offhook state, unable to dial out, unable to detect rings. Reboot and 
> Power off/Power on did not help. Any suggestions? Might be just my 
> luck.. just my luck.

If you're sure that jack is a fxo module, then I'd call digium support.