Sending a fax through Obi202?
UserAsdf:
Hello. When attempting to call a fax machine, the incoming audio is very quickly "cut off" when the answering fax machine begins emitting tones. The line remains open, but no audio from the answering side is allowed through. This happens when using both Callcentric and voip.ms through my Obi202.
When calling the same numbers using softphones, everything appears to be fine.
I've been sending/receiving faxes on Vonage for over 8 years with an ancient ATA, so I know faxing over voip works. ;D
Does something need to be changed in my Obi202 to allow faxing through it?
???
pc44:
Hi UserAsdf,
Here's a stab in the dark.
I wonder if the quick "cut off" is the OBI is misunderstanding the initial fax tones as some sort of DTMF. If so, one thought is to try different options for the DTMFMethod under...
Service Providers -> ITSP Profile AorB -> General -> DTMFMethod ->
Also, do you know what codec is in use during these attempted fax calls? During the call, if you check Status -> Call Status -> Audio Codec, it should tell you what codec is in play during the call. I've heard of people having better success faxing with G711 on CC, and I've heard of people having better success faxing with T.38 on CC. So, trying each might help figure this out. :)
pc44
UserAsdf:
Hello. This is what I suspected also, but I'm not sure what to do about it.
I've tried changing the DTMFMethod to both Inband and RFC2833, disabling all codecs except T.38, and trying both phone ports.
At all times, the call status page shows G711 is in use. I would try forcing T.38 if I knew how. :)
pc44:
UserAsdf,
Sadly, I'm not sure how to enforce T.38 either and have been unable to find much documentation regarding the use of T.38 in the admin guide. Additionally, I am not yet setup for T.38 and so cannot test this out just yet. I hope to be ready for T.38 service within a month, as I have been really looking forward to this capability on the OBI202.
In the interim, here is a link to a thread on another forum that talks about T.38 success with CC, albeit they are using a SPA2102. Still, it might offer some tips or insight into getting our OBIs working.
If you discover anything, be sure to let me know! ;)
pc44
Ostracus:
From the admin guide.
Quote
There are two Codec Profiles available on OBi devices. They are selectable Per Trunk (SP1/SP2/SP3/SP4/OBiTALK). To select a codec as the preferred codec in this profile, set the priority of that codec to be highest among all the enabled codecs in this profile. Each of the SP1, SP2, SP3, SP4, and OBiTALK services can be assigned a codec profile in its corresponding configuration. The codec list to use when setting up a call on the underlying service is formed from the list of enabled codecs in the chosen profile and ordered according to the assigned priorities in the profile.
There is also a star code for forcing a codec on a per call basis.
Code:
Code25
Default = Force G711u Codec Star Code *4711, Use G711 Only, set($Cdm1,3)
Code26
Default = Force G729 Codec Star Code *4729, Use G729 Only, set($Cdm1,4)
And I believe someone had mentioned that a provider that does T.38 (Callcentric does) may be needed for reliable faxing.
What would be nice to debug any problems is a faxing endpoint that one can fax to and see what's received on the other end. As well as fax back so one can see the same.
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