2 Asterisk servers 1.2.12.1 Connected via IAX2, same switch, GigE, no packet loss, etc
1 with a Sangoma A101 for a PRI to the PSTN Ulaw QoS enabled NAT for the registered ATA boxes, no nat between the * servers Faxing inbound: Call from PRI hits the first Asterisk server Then talks to the 2nd via IAX2 NVFaxDetect receives the fax, converts to PDF and emails it out Works great! Never had an issue The problem, however is outbound. Sipura 1001 ATAs. Fax machine connected to the ATA. Registered to the 2nd asterisk box. Keep in mind this server runs voice calls just fine. Outbound calls from this box are ulaw The call is then sent via IAX2 (also tried SIP as well) to the Asterisk server w/ the PRI, then out to the world Hit and miss to send faxes out Echo cancellation is enabled on the PRI I have lowered the rxgain and txgain to -5.0, seems fine for voice. The ATA is running 3.1.8 firmware from Sipura with fax detect turned Usually the faxes fail, but sometimes you will get all the pages, but only a fraction of the page. I have tried turning off ECM but still the same issue. I would suspect the Sangom or IAX2, or something of that nature except receiving faxes traveling to the 2nd asterisk box works just fine! I also tried to register the ATA to the primary Asterisk server w/ the PRI, same exact issue. Any ideas - better luck w/ Grandstream? I suspect the problem is not Asterisk, or the Sangoma, or jitter or bandwidth since receiving faxes works fine. I did not try to receive faxes through the ATA to the machine itself, I tried that a few months ago during other testing, never got it to work so I never tried again once I got NVFaxDetect working for email. My next step is to connect the fax machine to a Wildcard X100P. Any other suggestions? Black magic? Voodoo? Bill
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