when i dial 2000 i can hear the music, but when dial another extension such as 3555, it always fail . from CLI it seems try to dial 555 while not 3555.
I believe the _ in front of the 3XXX tells asterisk to ignore the first number dialed, i.e. _91NXX would tell asterisk to ignore the 9, in your case _3XXX tells the system to ignore the 3.
Dimitripietro and proberts0812 ,it works fine when these configured in extension.conf file but when execute in agi, i have test many times ,it will always drop the first digit. what 's wrong?