Here is an example to prepend 1212 to a 7 digit number:
voice trunk T01 type sip
match dnis "NXX-XXXX" substitute "1-212-NXX-XXXX"
Working like a champ, Thank you very much for the super fast response
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Does anyone know if there is a way to do it in the newer AoS products such as the 3140 with SBC?