I am having trouble with a fax machine connected to a fxs ports in a voice gateway.
The fax machine looks to be able to send faxes ok, but when an incomming call is received it rings onces then bascally hangs up.
From a "debug isdn q931" I can see a "user busy" error message is sent back to the caller.
When calling from an IP phone a "sh voice port sum" only show the call as connecing it never actually connects the call.
I have tried setting the fxs port as both sccp and mgcp, but symptions (?) are the same for both.
Any ideas on where to look nect would be greatly appreciated.