[asterisk-ss7] strange audio problem

[Kaloyan Kovachev]

Hello,
 i have a strange problem with a SS7 link - the audio quality is bad, but only
on incoming calls and only for the caller. The calls are forwarded via IAX to
another machine, which uses dahdi_dummy as timing, but i don't think it is the
problem as it should be in both directions then.

 My guess is that is is something to do with the dahdi jb, because setting it
to 'jbenable=yes' it caused one way audio in the same direction - where is the
code i should look at/update for this (chan_dahdi or dahdi)

 Any suggestions on how to locate the reason and fix it will be welcome.

Asterisk 1.6.1-r180467M with (quite old) version of ss7 patches from Domian
Dahdi trunk r6096 Echo Canceller
Wildcard TE220 (4th Gen) with hardware echo canceller