I am not sure it matters. I should probably do a wiki page on this.
I have successfully deployed t.38 with and without siptrunks. With PRI's
and with paper and paperless fax machines behind both trunks and pri's.
Not all sip trunk providers can do t.38. Not all ATA's can do t.38. In my
use cases I put all the ATA's "behind" sipx (trunked or PRI) so that they
register and all CDR is handled and tracked through sipx.
t.38 providers must support reinvite with sdp in order to communicate with
FS on sipx. The Audiocodes MP-202B looks neat, but even with an efax
account the fax machine needs to support https faxing. At least with a
traditional gateway you can use it for phone calls too. Patton Sn4112's are
only 40 dollars more than the 202B. I'm sure AC has a similar price point
on the MP-112's.
One of the more interesting things about that device is that it supports
t.37, so if we decided to build t.37 support into sipxconfig for users in
unified messaging to send faxes (by email), it can potentially be useful.
On Sat, Dec 1, 2012 at 4:36 AM, Michael Picher <***@ezuce.com> wrote:
> Definitely a hijack... But a good option for a few fax users, just need
> an efax account.
>
>
> On Sat, Dec 1, 2012 at 4:28 AM, ***@mattkeys.net <***@mattkeys.net>wrote:
>
>> I've been looking into buying the Audiocodes MP114 2fxo/2fxs for testing
>> t.38 when I ran across the MP202B with fax over HTTPS (
>> http://www.voipsupply.com/blog/audiocodes-mp-202b-httpsfax-adapter). I'm
>> curious if you (or anyone else reading) have tested the 202B while we're on
>> the topic. My apologies if that's considered thread jacking.
>>
>> ________________________________________
>> From: sipx-users-***@list.sipfoundry.org [
>> sipx-users-***@list.sipfoundry.org] On Behalf Of Tony Graziano [
>> ***@myitdepartment.net]
>> Sent: Saturday, December 01, 2012 3:43 AM
>> To: Discussion list for users of sipXecs software
>> Subject: Re: [sipx-users] Fax Service Question
>>
>> Realize if the ITSP does not offer t.38 on the initial invite FS will not
>> find a suitable codec for a fax transaction and off re-invite with t.38.
>> The provider must support re-invite with sdp if they do not send t.38
>> initially.
>>
>> IF t.38 is negotiated and the fax still fails, you will get a "ZERO" page
>> email with a TIFF attachment (blank). If it is successful you will get the
>> email as a pdf (assuming you are all patched up).
>>
>> I have tested against more than a few "t.38 compatible" providers, and
>> found many struggled with being able to offer guaranteed routes for t.38 in
>> general, so choose wisely or test thoroughly before you commit.
>>
>> _______________________________________________
>> sipx-users mailing list
>> sipx-***@list.sipfoundry.org
>> List Archive: http://list.sipfoundry.org/archive/sipx-users/
>>
>
>
>
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