[Asterisk-Users] want to set a var in sip.conf

[Randy Bush]

i have extensions in locations across a number of telco area codes.
when someone in seattle picks up and dials 91234567, it would be
nice to transform it to 92061234567.  i would prefer not to have
an extension context per area code.  it would be cool to be able
to set a variable in the sip.conf bit for each phone with it's
geographic default area code.

or other folk may have a better hack.  please clue me.  the wiki
did not help.  thanks.

randy