exten => rn/Anonymous,1,VoiceMail(10,u)
exten => rn,1,Dial(SIP/10,25)
exten => rn,2,VocieMail(10,u)
- oder -
exten => rn,1,GotoIf($["${CALLERID(name)}" = "Anonymous"]?3)
exten => rn,2,Dial(SIP/10,25)
exten => rn,3,VoiceMail(10,u)
Ungetestet! ;-) Sollte z.B. mit Ziil-IT klappen.