[from-sip]

exten => 1000,1,Dial(SIP/1000,20)
exten => 1000,2,Voicemail(u1000)
exten => 1000,102,Voicemail(b1000)
exten => 1000,103,Hangup

exten => 2000,1,Dial(SIP/2000,20)
exten => 2000,2,Voicemail(u2000)
exten => 2000,102,Voicemail(b2000)
exten => 2000,103,Hangup

exten => 2001,1,Dial(SIP/2001,20)
exten => 2001,2,Voicemail(u2001)
exten => 2001,102,Voicemail(b2001)
exten => 2001,103,Hangup

exten => 2010,1,Dial(SIP/2010,20)
exten => 2010,2,Voicemail(u2010) 
exten => 2010,102,Voicemail(b2010)
exten => 2010,103,Hangup

exten => 2011,1,Dial(SIP/2011,20)
exten => 2011,2,Voicemail(u2011) 
exten => 2011,102,Voicemail(b2011)
exten => 2011,103,Hangup

exten => 2012,1,Dial(SIP/2012,20)
exten => 2012,2,Voicemail(u2012)
exten => 2012,102,Voicemail(b2012)
exten => 2012,103,Hangup

exten => 2013,1,Dial(SIP/2013,20)
exten => 2013,2,Voicemail(u2013)
exten => 2013,102,Voicemail(b2013)
exten => 2013,103,Hangup