Re: [hylafax-users] t38modem question

[Steve Underwood <steveu@xxxxxxxxxxx>]

On 04/03/2010 06:06 PM, Necati Demir wrote:
> On 2 April 2010 19:05, Steve Underwood <steveu@xxxxxxxxxxx 
> <mailto:steveu@xxxxxxxxxxx>> wrote:
>
>     On 03/31/2010 05:39 PM, Necati Demir wrote:
>
>         i contacted to the providers. as i already said; they say that
>         they
>         can send faxes with using linksys pap2. According to them, sending
>         faxes with linksys pap2 proves that they have t38 support. But
>         i can
>         not send fax with t38modem.
>
>     The PAP2 does not support T.38. The SPA2102 and SPA3102 support
>     T.38, but not the PAP2 or PAP2T.
>
>
> Then, how faxing works with PAP2T? Is there another protocol to send fax?
Its only way to send FAX with a PAP2T is using ulaw or alaw audio. This 
is a quirky arrangement, as it is utterly intolerant of packet loss, and 
has serious issues with jitter buffering and sampling clock mismatch at 
the two ends of the link. The PAP2T (and a number of other ATAs without 
T.38 support) confuse many people into thinking there is T.38 support by 
having FAX related options in the configuration menus. These just adjust 
jitter-buffer behaviour to increase the likelihood of audio FAXing 
succeeding.

Steve


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