[OpenSER-Users] How configure Voice mail for multi users.

Hi All, i want to configure voice mail on Asterisk 1.4 for multiple users. let me explain you the scenario. i have 10 users with the name of 1000,2000,3000,4000,5000,6000,.......and these user can call to each other. Now i want to configure separate voice mail box for separate user. my extensions.conf ..... settings below.. [voicemail] exten => _X.,1,Dial(SIP/${EXTEN}) exten => _X.,n,NoOp(Dial Status: ${DIALSTATUS}) exten => _X.,n,Goto(s-${DIALSTATUS},1) exten => s-NOANSWER,1,Background(vm-nobodyavail) exten => s-NOANSWER,n,VoiceMail(${EXTEN}@usersmail) exten => s-NOANSWER,n,Hangup() exten => s-CONGESTION,1,Background(vm-nobodyavail) exten => s-CONGESTION,n,VoiceMail(${EXTEN}@usersmail) exten => s-CONGESTION,n,Hangup() exten => s-CANCEL,1,Background(vm-nobodyavail) exten => s-CANCEL,n,VoiceMail(${EXTEN}@usersmail) exten => s-CANCEL,n,Hangup() exten => s-BUSY,1,Background(salesrep) exten => s-BUSY,n,VoiceMail(${EXTEN}@usersmail) exten => s-BUSY,n,Hangup() exten => s-CHANUNAVAIL,1,Background(vm-nobodyavail) exten => s-CHANUNAVAIL,n,VoiceMail(${EXTEN}@usersmail) exten => s-CHANUNAVAIL,n,Hangup() my voicemail.conf [usersmail] 1000 => 1212, userm, 1000(a)abc.com 2000 => 1212, userm, 2000(a)abc.com please help me how can i set calling number before send voice mail in users voicemail box. when i dial like VoiceMail(${EXTEN}@usersmail) voice mail not work and when i heard code user, like this VoiceMail(1000@usersmail) voicemail work fine. but i want to set if user dial 2000 or 3000 or 4000 it should be set automatically. thanks for your cooperations. regards, Asif