If you must use SIP, try using T.38 (make sure your upstream provider supports it). If for some reason you can't, use G.711 (and not any compressed codec).
You could also replace your ATAs with something like this: https://www.voipsupply.com/manufacturer/sangoma/sangoma-fax-station-applliances which basically faxes to the local appliance, transmits it over the internet with TCP, then faxes to the destination from the far end (skipping any lossiness on your local internet connection). There are other products that work the same way but I can't remember them right now. For efax, a previous employer used this platform (because of the HIPAA compliance): https://www.scrypt.com/ There's also just https://www.efax.com/ Twilio used to have a fax product, and when they retired it they suggested a couple alternatives, including https://www.fax.plus/ and https://www.mfax.io/. They're all a little different, I would try them out, look at pricing etc., see what works for you. On Thu, Apr 18, 2024 at 10:22 PM KARIM MEKKAOUI via VoiceOps < [email protected]> wrote: > Hi VOIPOPS Community > > > > Do you know about any fax over internet solution that works? We tried > multiple ATA and multiple ATA configurations, sometime it works sometimes > not. > > > > Also, do you know about any eFax solution provider that works good. > > > > Thanks in advance for your help. > > > > KARIM > > MEKTEL INC. > > > _______________________________________________ > VoiceOps mailing list > [email protected] > https://puck.nether.net/mailman/listinfo/voiceops >
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