Something

[from-analog]
;
exten => s,1,Dial(SIP/1333&SIP/2333,20)
exten => s,2,Voicemail2(u1333)
exten => s,3,Hangup
exten => s,102,Voicemail2(b1333)
exten => s,103,Hangup
;
;
; Always put these two extensions in any "main" context that handles
;  call processing, for good form and graceful hangups.
;
exten => i,1,Hangup
exten => h,1,Hangup