asterisk users - Jun 2007 - Fax Throughput

I've tried timing faxes two ways:

Don Kelly wrote:
>I've tried timing faxes two ways:
>
>>From a fax machine on a station port of an AltiGen PC/PBX served by an
MCI
>PRI calling back into the same PRI and reaching a RightFax server on a
>station port behind the AltiGen.
>
>>From the same fax machine on the same station port of the AltiGen PC/PBX
>served by the same MCI PRI calling a number on an XO PRI connected to an
>Asterisk system (Digium TE410P), dialing out on another channel on the same
>PRI back into the MCI PRI and reaching the RightFax server on the station
>port behind the AltiGen.
>
>extensions.conf includes:
>exten => 6122353002,1,dial(zap/g1/6122590773)
>
>Sending a one-page fax with moderate density (no graphics) takes almost five
>minutes longer going through the Asterisk server.
>
The longer transmit time is probably a result either (or both)...

1) retransmissions due to the audio being consistently corrupted, and 
ECM retransmissions to correct the corruption

2) training failure (probably due to corrupt audio) resulting in a 
slower transmission rate (e.g. 9600 bps vs 14400 bps)

As to how to fix it... it's almost certainly audio degredation occurring 
in your Asterisk configuration or linkage... so debug your Asterisk setup.

Lee.

Can you post your zaptel.conf so we can verify your timing settings?

---
Matthew Fredrickson
Software Engineer
Digium, Inc.

On Jun 25, 2007, at 11:10 PM, Don Kelly wrote:
> I've tried timing faxes two ways:
>
> From a fax machine on a station port of an AltiGen PC/PBX served by  
> an MCI
> PRI calling back into the same PRI and reaching a RightFax server on a
> station port behind the AltiGen.
>
> From the same fax machine on the same station port of the AltiGen  
> PC/PBX
> served by the same MCI PRI calling a number on an XO PRI connected  
> to an
> Asterisk system (Digium TE410P), dialing out on another channel on  
> the same
> PRI back into the MCI PRI and reaching the RightFax server on the  
> station
> port behind the AltiGen.
>
> extensions.conf includes:
> exten => 6122353002,1,dial(zap/g1/6122590773)
>
> Sending a one-page fax with moderate density (no graphics) takes  
> almost five
> minutes longer going through the Asterisk server.
>
> Any suggestions?
>
>   --Don
>
> Don Kelly
> PCF Corp
> Real Support for your Virtual Office
> 651 842-1000
> 888 Don Kell(y)
> 651 842-1001 fax
>
>
>
>
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