here is the diagram :
PSTN <-E1 Q931-> 2821 <-IP-> CCM4.2 <-IP-> 2821 <-E1 QSIG-> Bosch PBX <--> Bosch Phone n?6000 forwarded to his bosch voice mail.
When a call come from the pstn to the 6000, the user fall on the general voice message and not on the 6000's voice mail.
If I make a call from an IP Phone to the 6000, everything is ok. I fall on 6000's voice mail and I can let a message.
Would someone have an idea how to resolve this kind of problem ?