[Asterisk-Users] Misdn 0.2.1 BUSY tone

[Tommaso Calosi]

I have this problem on misdn 0.2.1:
in extension.conf  i have such a situation;

[misdn_incoming]
exten => 06786541,1,Dial(SIP/203)

where SIP/203 is a GXP-2000.

I want to make the 203 to answer just one call at the same time, so i've 
disabled the call waiting feature on the phone, but when I do this the 
caller does not hear the Busy tone, it receives the telco "Network 
error" tone.

I want the caller to receive the busy tone when the called is busy . How 
can I do this?