asterisk users - Nov 2014 - OT - Is T.38 possible on SPA8800 FXO port ?

Hello,

If I'm not mistaken, it is not possible to get T.38 on a SPA3102 FXO
port (it is possible with the FXS port).
Do you know, by experience preferably, if this is possible with an
SPA8800 FXO port ?


Regards

T.38 is a relay protocol for transmitting Group 3 facsimiles over  a packet
network. It has
nothing to do with the analog FXS or FXO signaling, but it should not be too
difficult to use
Asterisk as a gateway. I never needed to do this myself, so I can't tell
whether there are any
subtle points.

jg

On 17/11/2014 6:42 PM, Olivier wrote:
> Hello,
>
> If I'm not mistaken, it is not possible to get T.38 on a SPA3102 FXO
> port (it is possible with the FXS port).
> Do you know, by experience preferably, if this is possible with an
> SPA8800 FXO port ?
>

Perhaps page 50 (Using a Fax Machine) of this document 
http://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/csbpvga/ata/administration/guide/ATA_AG_v3_NC-WEB.pdf
will answer your question.

There is also another document you may want to reference.

https://supportforums.cisco.com/sites/default/files/legacy/8/1/0/42018-SPA8800_Asterisk_101909.pdf

In your sip.conf configuration you will need;

canreinvite=no

For newer version of Asterisk I expect you would set;

directmedia=no


You may want to change the SPA8800 option 'FAX T38 Redundancy' to the 
value you have set for redundancy in udptl.conf or 3 if using the 
default settings.

It's been a while since I played with my SPA8800, with the test I 
performed it did work, that was inbound and outbound calls.

Larry.