[asterisk-users] How to set udptl.conf ?

[Steve Underwood]

Mark Michelson wrote:
> Olivier wrote:
>   
>> Hi,
>>
>> voip-info.org <http://voip-info.org> is almost silent regarding 
>> udptl.conf except with
>>  "Depending on your fax device (such as the Linksys 3102) you may have 
>> to edit the udptl.conf file. The error correction type that is sent is 
>> usually the culprit of many problems with ATAs and T.38 providers."
>>
>> Can anyone elaborate on this ?
>>
>> Regards
>>
>>     
> If you look at configs/udptl.conf.sample, all the options are outlined there, 
> although the explanations are very brief. The most likely setting that is 
> referred to on voipinfo is the T38FaxUdpEC setting. Possible values are 
> t38UDPFEC and t38UDPRedundancy, with the former being the default. Looking at 
> the code, it appears that the options are case-sensitive for udptl.conf, which 
> is quite a bit different from the rest of Asterisk, so be sure to get the case 
> correct.
>   
t38UDPFEC seems like it should be the default, as its the more 
sophisticated correction scheme, and if the other end can't support it 
things should fall back to t38UDPRedundancy. In practice, 
t38UDPRedundancy tends to outperform t38UDPFEC, and is probably the 
better choice.

Steve