atcomsystems.ca/forum Forums TDM Business Telephone Systems Comdial Telephones & Systems DX-120 fax detection

We are having a problem with a DX120 installation set up for fax detection. I'm curious if anyone else has run into this problem. Here's what happens.
1) a fax comes in on line 4
2) DX-120 answers the call
3) DX-120 detects CNG tone and transfers to ext 149
4) Fax rings and answers
5) Fax receives a busy signal and call terminates

Here's the testing we've done.
1) Connect fax directly to CO--works fine
2) send fax from IST port 150 to 149--works fine
3) send fax from IST port 150 to 151 which in turn was looped to line 4--works fine
4) padded co line with from 34 millamp to 18 milliamp--no go

Comdial tech suppport is working on this but hasn't provided any answer yet.

I have 3 120's in but haven't used fax detection yet. I have a new 120 in the shop I could test it on if you haven't already tried another system, but it might be late tomorrow before I get to it.

At what point does it go busy? Does it even try to ring 149?
I'd like to know how this ends.
Mark

We've had hit-and-miss luck with the fax detection on the DX-80, so I try to steer people away from using it. The problems we've had have never been what you're describing, though.

I'm curious whether you have a DX80 you could temporarily put in place of the 120, to test the same setup on, just to isolate it to the 120 for sure.

We already changed the system out with a another DX-120--same results. Yes, 149 does ring so fax detection is working fine.
We've never had trouble with the DX-80 fax detection that I know of accept for when callers send a fax manually. Of course there is no CNG tone to be dedected when you send a fax and wait for the far end to answer before hitting start on the sending machine.
I could put a DX-80 in place but haven't done so since I don't want that to be the solution.

so it rings 149 and passes a busy instead of the CNG, I'm going to need to get my system set up here so I can see it too. Since the problem occurs during the transfer after detection, try answering a fax call and manual transfer to 149.
Mark

I have three DX-80s that I have the fax Detection turned on---including here at the office---all with good results so far. However, we had a business try to fax us something one day---and it just would not go through---same scenario as yours. We tested from other places and it worked fine. I tried to find out what it was at that one location that was different than everyone else's --but I couldn't find out. I had thought that they were sending in manual mode and then pushing "start" when they heard the CNG tones--but they insist they weren't. I don't know that for sure, though. Tell us what happens.

Just installed 2 120 systems at years end. Only one was set for fax detection. During setup and training all worked perfect. Several days after install, customer calls and says they haven't been getting faxes. The only time I've had this problem is with DSL equipped lines. I did not spend much time trying to "fix" this so detection was turned off and the fax extension was set to direct ring. Works fine in this mode.

Mark. Manually answering the call and transfer to 149 works fine.
Jwooten. I did not think of the fact that DSL could be an issue. I need to check that out.

Any new news on this ?
Mark

Issue is still not resolved. I need to have some more testing done on our test bench.