[Asterisk-Users] Invalid GSM data

[CHAUVELIN Samuel]

I use my asterisk to SIP H323 Gateway.

Softphone SIP <-> Asterisk <-> H323 Gateway <-> cellular phone

I hear very well in my spftphone when i speak in my cellular
But when i speak in my softphone the sound is very very very bad 

and i have this message in CLI console of asterisk :

codec_gsm.c:164 gsmtolin_framein: Invalid GSM data

What is the pb ???