[Asterisk-Users] nativ bridging problem with ilbc!!

[Atuc]

hallo all,

could sombody please help me,

i dont know why nativ bridging is not working when i choose the ilbc codec, 
with speex it is working,??

iaxcomm (ilbc) --->    asterisk   --> ( asterisk2 --> sip grandstream (alaw) )
     \-----------------native bridge------------------/


1. if i use on iaxcomm as default speex, nativ bridging between iaxcomm and 
my sip phone is working
2. if i use ilbc on iaxcomm and try from an pat network (no native 
bridging!!) the code translation on my * (asterisk2) server works fine
3. if i use ilbc on another (not mine, mine does not work with ilbc) 
grandstream adapert everything works (no code translation)
4. if i use like the same like in 1. but ilbc instead of speex, it 
sometimes works, most of the time not, only one side hears the other.

does sombody has an idea what teh problem could be? why this only happens 
with ilbc codec?
i have ilbc enabled and as first codec in all iax.conf's and also in the 
sip.conf

thanks,
alex