[asterisk-users] TE2XXP and modems

[Joe Carroll]

Jeremy...    Just curious, do you use SIP/RTP at all for fax/modems ?

From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Jeremy Mann
Sent: Wednesday, May 28, 2008 9:47 AM
To: 'Asterisk Users Mailing List - Non-Commercial Discussion'
Subject: Re: [asterisk-users] TE2XXP and modems

Just make sure echocancel is disabled when bridged and you should be fine.  Also whatever card you get, make sure the timing is set properly.  I have a 2-port sangoma much like your setup, the PRI is the main timing source, the 2nd port goes to a Nortel which inherits timing from the PRI as well.  Once timing was setup properly my modems/faxes work fine.

From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Joe Carroll
Sent: Wednesday, May 28, 2008 8:31 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [asterisk-users] TE2XXP and modems

We are doing something similar  today with successful phones, fax, and modem...   PURE TDM..  no SIP

Example Below....

PSTN ----<PRI(s)> ----  <Asterisk> ---------------- <Nortel PBX> ---- Phones, faxes or modems
                                                      |
                                                      |
                                                      |
                                                      |------------------ <Avaya PBX>---- Phones, faxes or modems


From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Olivier
Sent: Wednesday, May 28, 2008 2:36 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [asterisk-users] TE2XXP and modems

In fact, today's setup is :
PSTN ----<PRI> ----  Alcatel OXE PBX ---- Phones, faxes or modems

I'm wondering if inserting an Asterisk server between PBX and PSTN would break modems and faxes.
For phones, I'm confident it will work.
Any call that will cross Asterisk would be treated without any echo cancellation or codec translation.

So the main question is "is TE2XXP-enabled Asterisk able to switch TDM without introducing latency that would spoil modem or fax services ?".

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