[asterisk-users] extensions.conf 4 digit dialing question

[Jerry Bonner]

Hi all,
 
Does anyone have any tips on how I would accomplish a plan where if a
user dials 4 digits, then prefix 6 digits, then if there is a local
extension configured for that number dial it, otherwise send it out
another sip gateway ( my pstn gateway)?
 
Perhaps more specifically, are there any construtcs that would "dial
extension if exists"? Because I want to make sure I dial a sip extension
before routing it out to the pstn.
 
~jerry
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