Sending a fax through Obi202?
QBZappy:
Have a look above. I have a post where you can test with several fax services. Give that a try.
UserAsdf:
Sorry, I guess I'm not being clear enough. I'll try again. :)
The fax never even begins transmission because the answering fax machine's tones are being cut off by the Obi202 almost immediately.
It's not a matter of fax quality or fax errors. The issue is the Obi not allowing the fax tones to come through on the line at all. I've tried multiple fax numbers.
QBZappy:
UserAsdf,
I have reread your entries more carefully. You may still have a defective unit, however I can suggest a few other things to try.
Checklist
1) You are certain that that the Service Provider supports T38 codec? From this reply it doesn't sound like it. Just to be clear, was it the OBiMAN voice or a CC voice message?
Quote from: UserAsdf on July 04, 2012, 04:20:21 pm
I've already tried disabling all codecs except T.38 a few days ago. That resulted in an error message saying something about the service provider not supporting the call or something.
2) You obviously have followed the CC fax FAQ (http://www.callcentric.com/faq/30#205 )
Fax Machine: Try using the slowest possible speed on your fax machine. Normally 9.6k or 14.4k would be the best options, as speeds faster than 14.4k may not work properly with faxing. Disable error correction
T.38: Enable T.38.Disable echo cancellation and echo suppression. If available enable re-INVITE for faxes
Pass through:Try using the G711 codecs as these would offer more bandwidth.Disable echo cancellation and echo suppression Disable NSE, usually on Cisco/Linksys devices
Quote from: UserAsdf on July 02, 2012, 02:02:01 pm
At all times, the call status page shows G711 is in use. I would try forcing T.38 if I knew how. :)
I show a way how to force T38 codec up above. I assume you did the exact thing. You are certain that the fax is going over the CC trunk. I would try **1 or **2 before the fax number just to make sure you force it over the correct trunk. Since it shows using G711 it might be going over your GV account (if you have one, you didn't mention it).
Quote from: UserAsdf on July 04, 2012, 05:00:31 pm
The fax never even begins transmission because the answering fax machine's tones are being cut off by the Obi202 almost immediately.
I think that could be a symptom of many things including a codec issue, it may not have anything to do with a faulty OBi.
Failing the lack of proper Obihai documentation, I am forced to scavenge from other sources. We can find T38 Fax relay explained here: (May not be completely relevant to the OBi)
http://www.cisco.com/en/US/docs/ios/12_3/vvf_c/cisco_ios_fax_services_over_ip_application_guide/t38.html#wp1158066
SIP T.38 Fax Relay
•The transport protocols specified in the ITU-T recommendation for T.38 are Transmission Control Protocol (TCP) and User Datagram Protocol (UDP). However, for T.38 fax relay on Cisco gateways, only UDP is supported for the transport layer.
•If SIP T.38 fax relay is not supported by both gateways, the T.38 negotiation fails and the call reverts to an audio codec. <-- NB This might be what is happening to you.
•T.38 fax relay requires a 64-kbps transmission rate, the same amount of bandwidth as a voice call with the G.711 codec.
•Fax Calling Tones (CNG) are optional and are not used to initiate a switch to T.38 mode. Instead, Called Station Identifier (CED) tones or preamble flags are used.
•SIP fax relay does not rely on NSEs to signal a switch to T.38 mode. Standard RFC 2543 and RFC 2327 SIP and SDP signaling are used instead.
•If the fax rate disable command is configured on a dial peer, neither the originating nor the terminating gateway can enter into Cisco fax relay mode, T.38 fax relay mode, or fax pass-through mode. The fax rate disable command disables fax transfer support.
Hope this helps. I'm surprised that someone else with a CC fax setup has not replied to you directly.
UserAsdf:
Hello, and thanks for re-reading my posts! :)
Quote from: QBZappy on July 05, 2012, 08:56:39 am
1) You are certain that that the Service Provider supports T38 codec? From this reply it doesn't sound like it. Just to be clear, was it the OBiMAN voice or a CC voice message?
I've been using Callcentric for all of my fax testing, with the few voip.ms tests just to satisfy curiosity.
The error message came from the Obi device and not CC.
I disabled the following codecs when attempting to "force" T.38: G711u, G711a, G729, G726R32, iLBC
Quote from: QBZappy on July 05, 2012, 08:56:39 am
2) You obviously have followed the CC fax FAQ (http://www.callcentric.com/faq/30#205 )
Fax Machine: Try using the slowest possible speed on your fax machine. Normally 9.6k or 14.4k would be the best options, as speeds faster than 14.4k may not work properly with faxing. Disable error correction
Windows 7 Fax & Scan won't allow me to change the fax or port speed of my usb faxmodem, but I'm not sure if that's relevant when fax negotiation never even occurs due to the answering fax tones being silenced by the Obi202.
Quote from: QBZappy on July 05, 2012, 08:56:39 am
T.38: Enable T.38.Disable echo cancellation and echo suppression. If available enable re-INVITE for faxes
Pass through:Try using the G711 codecs as these would offer more bandwidth.Disable echo cancellation and echo suppression Disable NSE, usually on Cisco/Linksys devices
I attempted to call fax machines and confirmed both G711a and G711u were in use via the Obi202 call status page. Neither codec seemed to help.
I also sent screenshots of my config pages to Callcentric, and they couldn't find anything set incorrectly.
Quote from: QBZappy on July 05, 2012, 08:56:39 am
I show a way how to force T38 codec up above. I assume you did the exact thing. You are certain that the fax is going over the CC trunk. I would try **1 or **2 before the fax number just to make sure you force it over the correct trunk. Since it shows using G711 it might be going over your GV account (if you have one, you didn't mention it).
I did confirm the calls were going over Callcentric both via the Obi202 call status page and by calling my own fax number hosted by Callcentric. (Doing the latter results in voicemail prompts)
I also sent a support ticket to Obi via this url a few days ago:
http://obihai.com/supportTicketForm.php
but I haven't received a response yet. I linked this thread url in the support request.
pc44:
Quote from: UserAsdf on July 05, 2012, 01:44:41 pm
Windows 7 Fax & Scan won't allow me to change the fax or port speed of my usb faxmodem, but I'm not sure if that's relevant when fax negotiation never even occurs due to the answering fax tones being silenced by the Obi202.
Hi UserAsdf,
It may not be relevant, but if you want to adjust the maximum port speed for your fax modem, on your Windows 7 PC, I would go to Control Panel -> System and Security -> System -> Device Manager -> Modems -> Your Modem. Double-click on your modem entry. This should open another window. In this window, choose the tab marked "Modem." Here you should see a Maximum Port Speed setting. The thread that I referenced earlier regarding fax usage with CC suggested a speed of 14400; however, QBZappy's 9600 suggestion is probably a safer choice.
Again, it may not help, but I thought I'd just mention that. Also, from the thread I reference earlier, if it turns out that your OBI is not defective, I do think your best route is to see if anyone at CC is willing to directly troubleshoot your situation. As you are an active, paying customer of their service, they might.
Hope you get this eventually solved, :)
pc44
Navigation
[0] Message Index
[#] Next page
[*] Previous page