[asterisk-users] T.38 pass-through 488 handling problem

[Klaus Darilion]

Atis Lezdins schrieb:
> On Mon, Jun 8, 2009 at 2:06 PM, Klaus
> Darilion<klaus.mailinglists at pernau.at> wrote:
>> Hi!
>>
>> I have the following problem with Asterisk 1.4.23:
>>
>>
>> ATA w/ T.38             Asterisk          ATA w/o T.38
>>     --------INVITE-------->
>>                             --------INVITE-------->
>>                             <-------200OK----------
>>     <-------200OK----------
>>     --------ACK----------->
>>                             --------ACK----------->
>>
>>
>>     --------INVITE w/T.38->
>>                             ------INVITE w/ T.38-->
>>                             <-----488--------------
>>                             ------ACK------------->
>>                             ------BYE------------->
>>                             <-----200--------------
>>
>> Asterisk does not forward the 488 back to the caller, but hangs up the
>> callee's call leg. Further, the caller's call leg will not be hung up.
>>
>> Is somebody aware of this problem and a fix?
>>
> 
> T.38 passthrough is possible if BOTH devices support T.38, so Asterisk
> don't have to transcode anything.
> 
> You could try 1.6 with some gateway app (don't remember if there
> exists any and in what state), or just write a RxFax which would then
> generate call with TxFax.

That's not the problem. Asterisk should just relay back the 488 so that 
Faxing happens with g.711.

regards
klaus