Assuming the 456 is the ATA number and the outside number is always 10
digits.

exten => _456.,1,Dial(SIP/${EXTEN:0:3}/${EXTEN:-10},tT)

but then it might as well be

exten => _456.,1,Dial(SIP/456/${EXTEN:-10},tT)

> ; to dial outside thru GSM gateway
> exten => _456.,1,Dial(SIP/${EXTEN},30,tTD(${EXTEN:3}))
> exten => _456.,n,Hangup 
>   

M

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