ATA Configuration for FAX line

Unanswered Question
Mar 16th, 2009

Hi All, I have several ATA 186's at a location that I'm using for analog fax lines. This site complains about fax's dropping and a multitude of other problems with faxing. I'm trying to narrow down what may be the problem. I kind of think that its the fax machine, the site has about seven of the same fax machines and sporadically all have complained about inconsistent faxing. We have a full PRI, running Call Manager business edition, MGCP as our Gateway protocol, SCCP as our device protocol. I'm wondering if my ATA configuration has something to do with this. I'm attaching a screenshot of the "audio" configuration of one of the ATA's that are having issues. Is this the correct Codec that I should be using? I'm also using “fax pass-through” and have enabled modem “pass-through” on my gateway configuration in call manager.

Thanks for the help,


I have this problem too.
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dan hale Mon, 03/16/2009 - 15:28

Hi, thanks for the reply, I've already disabled ECM and lowered the transmission speed to the lowest on all fax machines. My next thought was maybe something with the ATA config.




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