asterisk users - Jan 2007 - Fax through Sangoma A102

Hello,

in our company we are trying to do this:

Fax <--> Traditional PBX <--> Asterisk <--> PSTN

In practice, we have put an Asterisk equipped with a Sangoma A102 (2 PRI
ports) between our PBX (Siemens HiCom) and the PSTN in order to have a VoIP
network along the traditional telephony network.

The problem is with the fax. We just want to send and receive faxes from/to
our fax machine connected to the Siemens (without needing any interaction
with our VoIP network, the faxes are sent to/received from PSTN).
Unfortunately we are experiencing a lot of problems: the faxes not always
work and when they work, it's likely to have incomplete pages.

I know that faxing with VoIP is very troublesome, but maybe someone else is
using a similar configuration and he found a good configuration or maybe has
some hints to improve the results.

We are using Asterisk 1.2.13.

Thanks,
Jeremi
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jeremij jerome wrote:
> The problem is with the fax. We just want to send and receive faxes 
> from/to our fax machine connected to the Siemens (without needing any 
> interaction with our VoIP network, the faxes are sent to/received from 
> PSTN). Unfortunately we are experiencing a lot of problems: the faxes 
> not always work and when they work, it's likely to have incomplete
pages.

What are you using to fax?  Fax machines connected to ATAs?  
txfax/rxfax?  IAXmodem and HylaFAX?

If you are using IAXmodem and HylaFAX a fax session log (HylaFAX) would 
be quite revealing.

Lee.

Incoming faxes, the Sangoma will detect the tones and disable echo cancel.
 
To send outbound, you will have to add another trunk group, of one or more
channels and disable echo cancellation and use that to dial out.
 
Example (/etc/asterisk/zapata.conf)
blah blah
echocancel=yes
blah blah 
group = 1
channel =>1-20
 
blah blah
echo cancel=no
group = 2
channel=22-23
 
So you would use for faxing specifically Zap/g2/<number> and it will use
channel 22 or 23 but with echo turned off.
 
Use Zap/g1 and it will use the first group of channels with echo cancel on (or
whatever other parameters come before the group command)
 
Bill
 

________________________________

From: asterisk-users-bounces@lists.digium.com on behalf of jeremij jerome
Sent: Tue 1/9/2007 10:52 AM
To: asterisk-users@lists.digium.com
Subject: [asterisk-users] Fax through Sangoma A102


Hello,
 
in our company we are trying to do this:
 
Fax <--> Traditional PBX <--> Asterisk <--> PSTN
 
In practice, we have put an Asterisk equipped with a Sangoma A102 (2 PRI ports)
between our PBX (Siemens HiCom) and the PSTN in order to have a VoIP network
along the traditional telephony network.
 
The problem is with the fax. We just want to send and receive faxes from/to our
fax machine connected to the Siemens (without needing any interaction with our
VoIP network, the faxes are sent to/received from PSTN). Unfortunately we are
experiencing a lot of problems: the faxes not always work and when they work,
it's likely to have incomplete pages.
 
I know that faxing with VoIP is very troublesome, but maybe someone else is
using a similar configuration and he found a good configuration or maybe has
some hints to improve the results.
 
We are using Asterisk 1.2.13.
 
Thanks,
Jeremi
 
 
 
 
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