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Hello All,
I'm new to the forums, so first, an official Hello to everyone, this has been a much-appreciated wealth of knowledge compared to whatever else is available on the internet.
So, onto my problem: I'm having an issue sending/receiving faxes. The issue began a few weeks ago; analog extensions in different sites could not fax internally. They would hear a second of the fax tone and then the call would drop. I tested within the same site and saw the same problem. I've verified the lines were set up properly (Fax Machine/User - No Redirect, etc) as well as an in-depth check of our network, yet test calls from both analog and VOIP extensions to the ports that our fax server are on fail with the same symptoms.
I wired a splitter into the analog port for one fax line, and proceeded to call - the extension calling was disconnected, but the fax machine was still attempting to handshake and the port showed in use. CM shows the call simply ending, and a telnet session into the phone itself shows an error of "HAPI_RTP_EGRESS_ERROR_PAYLOAD_TYPE" the moment the call drops. None of this occurs if I plug an analog telephone into the port and have a coworker answer when it rings.
I've attempted calling the analog extension from a number of different types of clients, including analog ports on the same and different switches, ST 230's within the site and outside, and a statically configured phone on the same VLAN and subnet as the switches. All failed if it were dialing a fax machine, and all succeeded with a analog phone and person. I've reset every component of the system and I've also verified that there is no packet loss, sniffed traffic for errant issues, and completely deleted the extension the fax ports are on and recreated them on a different switch only to experience the same problem.
I contacted our vendor who tried a few things, and then switched the CODEC from 128k to 64k. This fixed the problem, but it was set to 128k by me many months ago to fix handshaking/transmission errors. Setting it back to 128k makes no difference internally, but now incoming calls from OUTSIDE are failing with the same issue. It seems to me that the system is ignoring the preferences regarding fax-redirects or a CODEC issue. We recently went from 6.1 -> 7.0, but that was a few months ago.
I'm at a complete loss here, and I'm not sure my vendor is 100% sure of the 128k setting, or the true cause of the issue, so my question is: has anyone else experienced this, and/or does anyone have a recommendation as to the proper CODEC for faxes and whether or not that would cause a call to completely drop?
I'm new to the forums, so first, an official Hello to everyone, this has been a much-appreciated wealth of knowledge compared to whatever else is available on the internet.
So, onto my problem: I'm having an issue sending/receiving faxes. The issue began a few weeks ago; analog extensions in different sites could not fax internally. They would hear a second of the fax tone and then the call would drop. I tested within the same site and saw the same problem. I've verified the lines were set up properly (Fax Machine/User - No Redirect, etc) as well as an in-depth check of our network, yet test calls from both analog and VOIP extensions to the ports that our fax server are on fail with the same symptoms.
I wired a splitter into the analog port for one fax line, and proceeded to call - the extension calling was disconnected, but the fax machine was still attempting to handshake and the port showed in use. CM shows the call simply ending, and a telnet session into the phone itself shows an error of "HAPI_RTP_EGRESS_ERROR_PAYLOAD_TYPE" the moment the call drops. None of this occurs if I plug an analog telephone into the port and have a coworker answer when it rings.
I've attempted calling the analog extension from a number of different types of clients, including analog ports on the same and different switches, ST 230's within the site and outside, and a statically configured phone on the same VLAN and subnet as the switches. All failed if it were dialing a fax machine, and all succeeded with a analog phone and person. I've reset every component of the system and I've also verified that there is no packet loss, sniffed traffic for errant issues, and completely deleted the extension the fax ports are on and recreated them on a different switch only to experience the same problem.
I contacted our vendor who tried a few things, and then switched the CODEC from 128k to 64k. This fixed the problem, but it was set to 128k by me many months ago to fix handshaking/transmission errors. Setting it back to 128k makes no difference internally, but now incoming calls from OUTSIDE are failing with the same issue. It seems to me that the system is ignoring the preferences regarding fax-redirects or a CODEC issue. We recently went from 6.1 -> 7.0, but that was a few months ago.
I'm at a complete loss here, and I'm not sure my vendor is 100% sure of the 128k setting, or the true cause of the issue, so my question is: has anyone else experienced this, and/or does anyone have a recommendation as to the proper CODEC for faxes and whether or not that would cause a call to completely drop?
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