Faxing problems only between two numbers

[ES-OGT]

I've got a customer that has multiple locations within a city. In this particular problem one location has a KM-5050 and the other has a KM-5035. When they try to fax to each other it will either time out or be unable to negotiate a baud rate. Faxing to any other number be it internal, local or long distance works without a problem.

I've updated firmware on both machines. Also, we have a "fax tester" that is basically nothing more than a mini NBX with two jacks so you can test faxes without the phone lines being a factor. Both machines test just fine without being connected to phone lines.

My gut is telling me there has to be something wrong on the phone company's end between the two numbers. However just in case I'm missing something I wanted to see if anyone else had any ideas.

[Eric1968]

Re: Faxing problems only between two numbers

You can try to lower the baud rate to 14k4 or 9k6, and switch off ECM.

[leo34staffs]

Re: Faxing problems only between two numbers

Ditto the ecm, have they got any line monitoring going on the line, (in the UK we have redcare) that monitors the alarm system and sends data down the line, it could be possible that is the issue, if it is you can get a modem conditioner (mcd) that sits between the fax and the line.

[blackcat4866]

Re: Faxing problems only between two numbers

A way to confirm this is to go to the two locations and do two things.

1) Do a basic line test (on-hook: -52vdc, 90vac; off-hook: -12vdc; ringing: 110vac).
2) Print an activity report. On that report examine Tx & Rx times. Are all Tx or Rx affected, or just to certain locations? If all are affected what average Tx or Rx time per page? 10 to 20 seconds per page: good. 20 to 40 seconds per page: just minimally functional line conditions. 40 second per page or more: poor line conditions.

It's almost certainly a local line condition specific to the couple of phone numbers. =^..^=