[Asterisk-Users] Problems with fax failing when bridged across TDM400Pvers E

[Chuck Bunn]

Hi,

I am running Asterisk 1.2 and zaptel 1.2 with the latest Digium board 
version.

Thanks

Andrew Kohlsmith wrote:

>On Tuesday 22 November 2005 08:54, Chuck Bunn wrote:
>  
>
>>What I do not understand is how dropped packets prevent the fax from
>>working. Faxes are designed to adopt to noise on the line by reducing
>>their connection speed. It seems like their is something else besides
>>packet loss going on here. Also why would the board work for receiving
>>faxes but not sending???
>>    
>>
>
>Faxes are designed to work around the noise and other signal problems inherent 
>in analog telephony.  VOIP introduces an entirely different set of noise 
>factors that fax machines are frankly ill-equipped to deal with.  Jitter and 
>dropped packets are the biggest of these issues.
>
>Now which version of Zaptel are you running (not Asterisk, Zaptel) -- was it 
>part of the Asterisk 1.0.x series, are you running 1.2 or CVS HEAD?  It is a 
>possibility that this issue is fixed now in CVS HEAD (possibly 1.2 as well, I 
>haven't been keeping track), so it is advisable to try the latest version of 
>Zaptel.  You do not need to upgrade to the latest Asterisk in order to use 
>the latest Zaptel.
>
>-A.
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