View Full Version : T.38 faxing
Does VOIPo support T.38?
I mean, if I have a device that sends/accepts faxes in T.38, VOIPo will correctly get that T.38 stream and will forward it along, right? And this should be pretty much error free, contrary to faxing over G.711?
chpalmer
12-10-2009, 09:58 AM
They dont support it. And the PAP2/RT31P2 does not have that available in them either...
I still have my Grandstream 286 that does have that codec and it works every time for me while the neither Linksys will finish the transmission without error...
Otherwise, The guys have some great faxing options....:)
I wouldn't use just PAP2 for this of course.
But I thought I saw t38 being offered in SDP stream on several occasions...
chpalmer
12-10-2009, 10:09 AM
So far what Im using kicks over our Vonage fax line at the offfice sold to us as a fax line...
VOIPoTim
12-10-2009, 10:10 AM
I wouldn't use just PAP2 for this of course.
But I thought I saw t38 being offered in SDP stream on several occasions...
We don't officially support it.
We use over a dozen upstream carriers and it's only supported by a few, so it would all depend on where the call happens to be routed.
We do offer a completely TDM-based fax solution for both incoming and outgoing faxes that doesn't use our VoIP network.
http://www.voipo.com/fax-to-email.shtml
chpalmer
12-10-2009, 10:15 AM
Thanks Tim... I was looking for a specific forum post from earlier this year but that link works...
chpalmer
12-10-2009, 10:18 AM
{hijack}
http://dilbert.com/
http://dilbert.com/dyn/str_strip/000000000/00000000/0000000/000000/70000/5000/900/75991/75991.strip.gif
{/hijack}
Yeah, I know about that solution. Comes with a monthly fee, right?
So when RTP is set to bypass your servers I'm at the mercy of the upstream providers... Same thing when you proxy the audio too?
How do end-user providers that officially support T.38 implement this then? Are they sticking only to those carriers that accept T.38 or are they transcoding and then using internal low-latency paths?
VOIPoTim
12-10-2009, 10:50 AM
Are they sticking only to those carriers that accept T.38 or are they transcoding and then using internal low-latency paths?
Either of these would work. Transcoding is an option we looked at in the beginning, but it's very resource-intensive.
fisamo
12-10-2009, 11:09 AM
IIRC, a Residential user can send a few outgoing FAXes a month with no fee and without raising any 'red flags'. I can't speak for certain right now, because I'm currently subscribed to a FAX line. :)
VOIPoJustin
12-10-2009, 11:46 AM
Outgoing fax functionality (from your vPanel account) comes included with all VOIPo Residential Accounts, free of charge.