In a previous company, we had issues with selling "Fax-o-IP" services
varying from the ability of CPE to support the correct NSE values and
recognize the difference between G3 ("standard" fax) and Super G3 ("more
like a modem" fax) through to the gateway's ability to turn echo-can's
on and off based on the fax type.Fax is SOOOOO sensitive to packet-loss, NSE response, the disabling/enabling of echo-can's based on G3/Super-G3... I have a pretty decent white paper I found on this subject I can forward to those that are interested offline ([EMAIL PROTECTED]) > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:asterisk-users- > [EMAIL PROTECTED] On Behalf Of Lee Howard > Sent: Wednesday, January 19, 2005 6:46 PM > To: Jon Radon > Cc: Asterisk Users Mailing List - Non-Commercial Discussion > Subject: Re: [Asterisk-Users] Fax and PRI > > On 2005.01.19 17:06 Jon Radon wrote: > > I use a Multi-Tech Multimodem ZPX and a Sipura SPA-2000 along with > > Hylafax. On the Asterisk end I'm using X100P's. This has worked > > flawlessly for me thus far. Some tips of my success. > > > > 1.) Fax detect on the Sipura breaks faxing. Strange, I know. > > 2.) Tuning your txgain and rxgain both on the Sipura and on the > > Zaptel line is imperative. > > > > Originally with this setup I was getting all kinds of bad frames. > > After tweaking my faxes are squeaky clean. > > Thanks for these tips it reminded me that I still hadn't looked in on > the FXS port ("line") settings on the SPA. (I don't receive many faxes > on this setup, so it hasn't been a priority.) > > As it turns out, disabling silence suppression, echo cancellation, echo > suppression, and all of the "fax" features did the trick. Now I'm > receiving faxes fine. > > I did also have to disable V.34-Fax on the HylaFAX-controlled modem. > > I didn't have to adjust any of the gain controls, although I already > had adjusted the FXS port impedence a long time ago. > > Lee. > _______________________________________________ > Asterisk-Users mailing list > [email protected] > http://lists.digium.com/mailman/listinfo/asterisk-users > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users _______________________________________________ Asterisk-Users mailing list [email protected] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
