> What are your experiences with faxing through Asterisk to the PSTN? > > We are using g.711u as a codec, and are originating/terminating with Broadvox as > well as through our own PSTN gateways. > > We have had some luck with incoming faxes coming into our network from Broadvox > DIDs. They work 50% of the time. Not sure yet on PSTN incoming since nobody > that is using FAX is in our local rate centers. > > Outgoing has been bad. It seems to work the best if the Sipura user agents have > echo cancelation off, but we have to have echo cancelation on our outbound > gateways or there is echo in the voice path. Faxing outbound works very > rarely, and if it does, it usually can only send a page or two before we get > the infamous "Poor line condition". > > Does anyone have a suitable FAX setup working?
Our company's ourbound faxing (as well as the tpc.int fax server I run personally) goes through Asterisk with no problems to speak of. I recall the gain settings in Asterisk and on our Adit 600 channel bank needed some tuning, but it seems to work well now. The negotiated V.34 fax speeds are slightly lower than a direct PSTN hookup, but we're rarely in that much of a hurry ;-) As far as I know, echo cancelation routines/devices are meant to detect fax tones and shut themselves off. I saw this in action once ... while playing a recorded fax call back to a customer Asterisk turned off echo cancelation and my call was instantly very ... entertaining (for me at least - the call still sounded normal for the customer). As for using lines from Broadvox, even with g.711u codec, I would think all bets are off. The only reliable option for fax over VoIP is probably going to be t.38 (when it grows up). -Darren -- Darren Nickerson Senior Sales & Support Engineer iFax Solutions, Inc. www.ifax.com [EMAIL PROTECTED] +1.215.438.4638 x8106 +1.215.243.8335 (fax) _______________________________________________ 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