08:11:45.672 Dropping call : after document timeout elapsed I will leave fax number pointed at the fax machine for now.įaxing from the fax machine to the fax extension works fine and you can see it negotiating versions, which it doesn't do for the NBE via G.711u. The fax errors out about twenty seconds in after the "Fax exchange" completes. I think the baked in fax server in 3CX does not like the G.711u codec from NBE/PRI (I enabled the beta feature since it is available). 16:41:51:459 -0500 INFO - .channel : Channel State Disabling fax tone detection 16:41:44:556 -0500 INFO - netborder : stop voice activity detection (VAD). 16:41:44:555 -0500 INFO - .device : disable echo canceller tone detected 16:41:44:300 -0500 INFO - netborder : stop voice activity detection (VAD). 16:41:44:299 -0500 INFO - .device : disable echo canceller tone detected 16:41:44:028 -0500 INFO - : RECEIVED SIP MESSAGE (REQUEST) via UDP from %PhoneServer%:5060 :ĪCK sip: %PhoneServer%:5066 transport=udp SIP/2.0 I'm running out of things to check, hostname check was never enabled, and Comcast's Adtran has to be configured, or else how could it connect at all? I might be able to pull a pcap out of the NBE.Īlso, I believe that the Cisco's configuration is mostly correct as I can fax to the default 888 perfectly fine and it will receive from an outside number without this hiccup.Īny ideas or suggestions would be appreciated. Putting the NBE in debug, I see it is communicating through 3CX normally, but then the logs just stop for 7 seconds before "CONNECTED" (it was already connected without disconnecting). I am seeing the normal INVITE, OK, and ACK that I think I should be seeing. Via Wireshark, the normal G711u call starts, when the fax tones are detected, a reinvite to the T.38 protocol starts, then the 3CX server waits 7 seconds before reconnecting (but now the whole fax session is fubar'd as the fax machine doesn't acknowledge it as a fax.). I have been going through any documentation I can find for the Cisco, Sangoma, and 3CX I can find, and I can't find where the disconnect is. Connecting into the Fax machine from an outside line seems to be completely normal. In the last week, I picked up a Cisco SPA 112 (again, unsupported by 3CX) and I am trying to make it work, but I am getting about 7 seconds of dead air right after the outbound fax tries to connect. The inbound faxing into 3CX has been working wonderfully and as expected for the last year and a half. I have an issue that I am sure I will get some heat about my configuration, I am using Sangoma's Netborder Express (unsupported by 3CX) successfully for the most part.
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