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greg at gregandeva.net
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 Posted: Thu Jan 17, 2008 11:38 am Post subject: [asterisk-users] modem through Zaptel/Digium? |
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This is just a low priority curiosity question because I have a usable
workaround.
I have Digium card that uses the Zaptel driver (can't get to my home
machine right now to get the exact model, but it probably doesn't
matter). It's a card with one POTS line and three extension hookups. I'm
using Asterisk 1.4 and Zaptel 1.4.7 .
One of the extension ports is connected to a modem on another computer.
This is a FAX modem that works well; I have * programmed to detect
incoming faxes and route them to this modem, and it works seamlessly. I
can also send outbound faxes with no problem.
The curiosity is that this modem does not work for dialup unless I
bypass the * server and connect it directly to the wallplate, then it
works fine. I don't see why it would be able to detect carrier and
negotiate with a fax machine through * and Zaptel, but not with a dialup
server.
--Greg |
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dfullertasterisk at sh...
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| Posted: Thu Jan 17, 2008 1:05 pm Post subject: [asterisk-users] modem through Zaptel/Digium? |
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Greg Woods wrote:
| Quote: | This is just a low priority curiosity question because I have a usable
workaround.
I have Digium card that uses the Zaptel driver (can't get to my home
machine right now to get the exact model, but it probably doesn't
matter). It's a card with one POTS line and three extension hookups. I'm
using Asterisk 1.4 and Zaptel 1.4.7 .
One of the extension ports is connected to a modem on another computer.
This is a FAX modem that works well; I have * programmed to detect
incoming faxes and route them to this modem, and it works seamlessly. I
can also send outbound faxes with no problem.
The curiosity is that this modem does not work for dialup unless I
bypass the * server and connect it directly to the wallplate, then it
works fine. I don't see why it would be able to detect carrier and
negotiate with a fax machine through * and Zaptel, but not with a dialup
server.
--Greg
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I think asterisk has the ability to detect fax tones and disable echo
cancellation for those calls. I don't know if that is the case with a
regular modem call. I'd check to make sure that echo cancellation is
disabled on the extension the modem is plugged into. The only other idea
is to try connecting at a lower speed (I would think this would happen
automatically though).
-Dave |
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jmann at txhmg.com
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| Posted: Thu Jan 17, 2008 1:28 pm Post subject: [asterisk-users] modem through Zaptel/Digium? |
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Is it bridging the Zap channels? We have asterisk doing FXO-FXS modem calls working fine, the key is making sure the channels are bridging and EC is NOT turning on. If you have anything preventing that the modem calls won't work.
-----Original Message-----
From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Dave Fullerton
Sent: Thursday, January 17, 2008 12:05 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [asterisk-users] modem through Zaptel/Digium?
Greg Woods wrote:
| Quote: | This is just a low priority curiosity question because I have a usable
workaround.
I have Digium card that uses the Zaptel driver (can't get to my home
machine right now to get the exact model, but it probably doesn't
matter). It's a card with one POTS line and three extension hookups. I'm
using Asterisk 1.4 and Zaptel 1.4.7 .
One of the extension ports is connected to a modem on another computer.
This is a FAX modem that works well; I have * programmed to detect
incoming faxes and route them to this modem, and it works seamlessly. I
can also send outbound faxes with no problem.
The curiosity is that this modem does not work for dialup unless I
bypass the * server and connect it directly to the wallplate, then it
works fine. I don't see why it would be able to detect carrier and
negotiate with a fax machine through * and Zaptel, but not with a dialup
server.
--Greg
|
I think asterisk has the ability to detect fax tones and disable echo
cancellation for those calls. I don't know if that is the case with a
regular modem call. I'd check to make sure that echo cancellation is
disabled on the extension the modem is plugged into. The only other idea
is to try connecting at a lower speed (I would think this would happen
automatically though).
-Dave
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