[cisco-voip] Troubleshooting Fax Problems

[Ed Leatherman]

ATA has two modes, "Fax mode" and "Fax Passthrough" mode. Functionally they
are both passthrough, but the "Fax Passthrough" mode will actually act like
an IOS gateway configured for passthrough (negotiates codec/upspeeding)
whereas the "Fax mode" just treats the call as a normal voice call with no
fax tone detection or other bells and whistles.

You can switch modes by using a web browser to the ATA and setting the audio
mode and connect mode parameters:
Fax Mode: audio mode = 0x00120012, connect mode doesn't matter
Fax passthrough: audio mode 0x00150015 , connect mode = 0x90000400

If your voice gateway on the far end is setup for NSE passthrough, I would
recommend setting up the ATA for "Fax passthrough" if it is not already, and
see if it helps out.

On Fri, Sep 4, 2009 at 11:18 AM, Countryman, Edward <
Edward.Countryman at provena.org> wrote:

>  I have a remote site (50 users) trunked with a PRI to a 2821 router.  I
> use ata186’s for fax machines.  The users at this site are reporting that
> many of the folks that used to be able fax to them prior to moving in cannot
> now that they are on an ATA.  The fax machine reports “line failure” or “no
> fax detected” when this occurs.  Other sites can fax in no problem.  The
> gateway is set up for fax-pass-through and DTFM relay “Current GW Config”
> (?) and the DSPware is current (28x).  The ATA parameters of course are
> cryptic.  We are a CCM 61 shop
>
> I will likely go to tac but this is one of those problems that is painful
> to troubleshoot.  I was looking for thoughts and experiences on resolving
> these types of issues.
>
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>


-- 
Ed Leatherman
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