HOWTO install Asterisk Management Portal ( FreePBX )

From RADION OpenLab

Regarding VoiceMail - if you don't like that your extension is revealed to the calling party - for instance if your DID differs from your "real" extension number most calling parties get confused and afraid of having called the wrong number.

FreePBX's default behaviour is to always tell the number. If you want to change that you have to make some minor modifications to the dialplan in extensions.conf manually (macro-vm to be precise):

[macro-vm]
exten => s,1,Macro(user-callerid,SKIPTTL)
exten => s,n,Set(VMGAIN=${IF($["foo${VM_GAIN}"!="foo"]?"g(${VM_GAIN})":"")})
;
; If BLKVM_OVERRIDE is set, then someone told us to block calls from going to
; voicemail. This variable is reset by the answering channel so subsequent
; transfers will properly function.
;
exten => s,n,GotoIf($["foo${DB(${BLKVM_OVERRIDE})}" != "fooTRUE"]?s-${ARG2},1)
;
; we didn't branch so block this from voicemail
;
exten => s,n,Noop(CAME FROM: ${NODEST} - Blocking VM cause of key: ${DB(BLKVM_OVERRIDE)})

exten => s-BUSY,1,NoOp(BUSY voicemail)
exten => s-BUSY,n,Macro(get-vmcontext,${ARG1})
;exten => s-BUSY,n,Voicemail(${ARG1}@${VMCONTEXT}|${VM_OPTS}b${VMGAIN})   ; Voicemail Busy message
exten => s-BUSY,n,Voicemail(${ARG1}@${VMCONTEXT}|${VM_OPTS}${VMGAIN})   ; Voicemail message without extension
exten => s-BUSY,n,Goto(exit-${VMSTATUS},1)

exten => s-DIRECTDIAL,1,NoOp(DIRECTDIAL voicemail)
exten => s-DIRECTDIAL,n,Macro(get-vmcontext,${ARG1})
exten => s-DIRECTDIAL,n,Voicemail(${ARG1}@${VMCONTEXT}|${VM_OPTS}${VM_DDTYPE}${VMGAIN})
exten => s-DIRECTDIAL,n,Goto(exit-${VMSTATUS},1)

exten => _s-.,1,Macro(get-vmcontext,${ARG1})
;exten => _s-.,n,Voicemail(${ARG1}@${VMCONTEXT}|${VM_OPTS}u${VMGAIN})     ; Voicemail Unavailable message
exten => _s-.,n,Voicemail(${ARG1}@${VMCONTEXT}|${VM_OPTS}${VMGAIN})     ; Voicemail message without extension
exten => _s-.,n,Goto(exit-${VMSTATUS},1)

exten => o,1,Background(one-moment-please)      ; 0 during vm message will hangup
exten => o,n,GotoIf($["x${OPERATOR_XTN}"="x"]?nooper:from-internal,${OPERATOR_XTN},1)
exten => o,n(nooper),GotoIf($["x${FROM_DID}"="x"]?nodid)
exten => o,n,Dial(Local/${FROM_DID)@from-pstn)
exten => o,n,Macro(hangup)
exten => o,n(nodid),Dial(Local/s@from-pstn)
exten => o,n,Macro(hangup)

exten => a,1,Macro(get-vmcontext,${ARG1})
exten => a,n,VoiceMailMain(${ARG1}@${VMCONTEXT})
exten => a,n,Hangup

exten => exit-FAILED,1,Playback(im-sorry&an-error-has-occured)
exten => exit-FAILED,n,Hangup()

exten => exit-SUCCESS,1,Playback(goodbye)
exten => exit-SUCCESS,n,Hangup()

exten => exit-USEREXIT,1,Playback(goodbye)
exten => exit-USEREXIT,n,Hangup()

exten => t,1,Hangup()