VoIP Mailing List Archives

[stotaro at totarotechn...]

On Mon, May 26, 2008 at 5:36 PM, Olivier <oza-4h07 at myamail.com> wrote:

[matt at mattgwatson.ca]

On May 26, 2008 05:39:52 pm Steve Totaro wrote:

[stotaro at totarotechn...]

Have you tried faxing and modems directly through the Alcatel? If it
works well, then I would not expect too much of an issue.

The main issue with faxing and modems are latency and lossy codecs.
TDM with alaw/ulaw end to end "should" be OK.

Thanks,
Steve Totaro

On Tue, May 27, 2008 at 2:51 AM, Olivier <oza-4h07 at myamail.com> wrote:

[stotaro at totarotechn...]

On Wed, May 28, 2008 at 2:36 AM, Olivier <oza-4h07 at myamail.com> wrote:

[Joe at myl2n.com]

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 ?".

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20080528/be849156/attachment.htm

[shmaltz at gmail.com]

I do this all the time with channel banks with no rpoblem whatsoever

On 5/28/08, Joe Carroll <Joe at myl2n.com> wrote:

[jmann at txhmg.com]

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 ?".

________________________________
This e-mail, facsimile, or letter and any files or attachments transmitted with it contains information that is confidential and privileged. This information is intended only for the use of the individual(s) and entity(ies) to whom it is addressed. If you are the intended recipient, further disclosures are prohibited without proper authorization. If you are not the intended recipient, any disclosure, copying, printing, or use of this information is strictly prohibited and possibly a violation of federal or state law and regulations. If you have received this information in error, please notify Texas Health Management Group immediately at 1-817-310-4999. Texas Health Management Group, its subsidiaries, and affiliates hereby claim all applicable privileges related to this information.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20080528/438faa1c/attachment-0001.htm

[Joe at myl2n.com]

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 ?".

________________________________
This e-mail, facsimile, or letter and any files or attachments transmitted with it contains information that is confidential and privileged. This information is intended only for the use of the individual(s) and entity(ies) to whom it is addressed. If you are the intended recipient, further disclosures are prohibited without proper authorization. If you are not the intended recipient, any disclosure, copying, printing, or use of this information is strictly prohibited and possibly a violation of federal or state law and regulations. If you have received this information in error, please notify Texas Health Management Group immediately at 1-817-310-4999. Texas Health Management Group, its subsidiaries, and affiliates hereby claim all applicable privileges related to this information.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.digium.com/pipermail/asterisk-users/attachments/20080528/07c7b0c8/attachment.htm

[creslin at digium.com]

Olivier wrote: