[extensions.conf]Dial by letters, not number

Hello,

I have some registred users whose username is letters and not a number. My dial plan is

exten => alice,1,Dial(SIP/alice,60,t)
exten => bob,1,Dial(SIP/bob,60,t)

Can we generalize these above lines to an unique line ?

Thanks,

You can try

exten => _[a-zA-z].,1,Dial(SIP/${EXTEN}, 60, t)