sundance-communications.com/forum Forums TDM Business Telephone Systems Samsung Telephones & Systems OS500 can not recive fax

Hi, Im having a problem with the reception of faxes.
If I recive a fax through an analog line, I recived fine, with no problem. But if the fax it´s recived through the E1 (TEPRI Card) using a DID, the transmission is interrupted.

Anyone knows what can I do?

I called with the carrier and told me that the problem it´s de PBX.

Thanks

Regards
Edgar Robles

Some food for thought.


Analog call translated to digital signal then translated back to analog.

Here is a cut and paste to save time. This is the best info I have ever read
You have a T1 into you PBX, voice calls are not a problem, but you can’t send a FAX. The T1 that you are leasing from the LEC is terminated into a Digital Crossconnect System (DSC) at the CO. The LEC uses the DCS to connect the T1 channels to CO carrier channel banks with FXO channel units. This takes the digital channels to analog to connect to the CO switch ports (POTS).
T1 coding has two options ESF/SF (SF is listed as D4 on some test sets) B8ZS/AMI. If the ESF/SF options at each end of a T1 do not match the system will not sync up and the T1 will not work at all. T1 transmission requires at lease a 17% ones density to keep sync. G.711 coding of voice is rich in ones. Data can have a high number of zeros causing a carrier system to have a low ones density. To overcome this B8ZS was introduced. Any time a channel has all zeros; Binary 8 Zero Substitution (B8ZS) will replace the channel with 4 bits with 2 bipolar violations. When the equipment at the other end of the T1 detects the B8ZS code the equipment will replace the four one bits with all zeros.
B8ZS/AMI option must match at both ends of the CO DCS to carrier channel bank. When the DCS is optioned B8ZS and the channel bank is optioned AMI, voice will work ok but Fax’s will fail. This is difficult for the CO to find. If your PBX lines are spit between banks and only one is optioned wrong, sometimes you can send a FX sometimes you can’t, depending on witch co line you uses

i had trouble with the tepri card as well, found out that i had to upgrade the software to the newest version. this has fixed the problem so far.

Pull out the card and look on the back of the motherboard. If it says 01 it's the old board and needs to be modified and the new software added. New software alone will not fix the issue if the board has not been upgraded. I also have seen the only way to fix it 100% is to bring in a POTS line.