[default]
exten => 976,6,DISA(no-password|cme)

[cme]
exten => _8XX,1,Dial(SIP/${EXTEN},60,Ttr)
exten => i,1,Dial(SIP/812)
exten => t,1,Dial(SIP/812)
exten => T,1,Dial(SIP/812)
exten => s,1,Dial(SIP/812)
exten => o,1,Dial(SIP/812)