[Asterisk-Users] transcoding prevention

[Pavel Jezek]

Hi, my setup is like:
phones (g729/g711)--(SER)--> Asterisk <--(oh323)--gateway (supports 
g729&g711)
problem begin when phone supports only g711 and Asterisk doesn't 
negotiate this codec in full path (from phone to gateway), but tries to 
do transcoding (and because I haven't g729 codec in asterisk, the call 
fail).
Is there any solution how to tell to Asterisk to negotiate codec, that 
is supported by both parties?
I read some posts like my problem, is any new recomendation or devel. 
progress so solve?
thanks
PJ