A vendor set up a CDP for all 17 of my offices (all 25.4 option 11s). When anyone in any of these offices dials 4000 the CDP deletes 4 and inserts an outside phone number. What I've noticed is in some of the switches the inserted # is programmed as 912125551212 and in others it programmed simply as 12125551212 (no lead 9). How is it determined whether the 9 is needed? I assumed that since this is technically an outside call I always need a 9. Thank you.