I'd say, consider your audience (user-base) and let common sense prevail. If your user-base is accustomed to business PBXs, they'll already expect to have to dial a 9 or 7 to "get out". In that case, number your extensions any way you like, must avoid that "outside" digit.
Personally, I prefer a "transparent" PBX, and this is my setup: 011... - International calls 1... - NANPA calls 2... - internal extensions 3... - external extensions (SIP/IAX clients) 411 - operator 6... - speed dial 8... - direct trunk access (in my case -- all IAX --, that means it will set the proper caller-id for outgoing calls) 911 - guess that that's for. The advantage here is that incoming calls can generally be returned without any digit-magic, just by selecting a number from the incoming call-list and pushing Redial or what have you. Since I use multiple providers, I have an agi script that "normalizes" this number for me (http://muware.com/asterisk) If you have a T1 with a thousand-block of DIDs, I'd recommend coordinating the extension with the DID#, such that -- 800-555-1234 corresponds to extension 2-1234, and 800-555-4637 can be dialed as 2-4637 internally. Ditto for voice-mail. And whatever you decide, make sure that 911 is idiot proof -- allow calling as 911, 7911, 9911, etc. > -----Original Message----- > From: Tim Burt [mailto:[EMAIL PROTECTED] > Sent: Monday, February 07, 2005 4:46 PM > To: [email protected] > Subject: [Asterisk-Users] How to number extensions - Which > way is best? > > > If this topic has been discussed already, please point me to > it. I have looked, and I don't see any discussion in the > past couple of months or in the wiki. > > When setting up your inside extensions, it can be helpful to > choose the numbering carefully. Ideally, you would like it > to not conflict with the dialing of an outside number. > > For example, the extension... > > 1212 > > Is very similar to dialing a new york long distance number: > > 1-212-555.1212 > > The phone company intentionally avoids some number > combinations. Local numbers never start with a "1". This > way, the Phone company switch knows that any number that > starts with a "1" needs long distance routing. > > ------------------ > > Some switch systems avoid this issue by requiring that > extensions dial a 9 to get an outside number. This allows > the use of any extension numbers internally, as long as they > do not begin with a "9"! > > I can setup asterisk to work this way. > > ------------------ > > What would be a wise choice for your extension numbering if > you were just setting up a new system? > > Is there a "better to use" set of extensions, that avoids > confusion with dialing of external numbers. > > ------------------ > > Or perhaps, I am way off base. Does asterisk have some magic > sauce that makes this a moot issue? > > Thanks in advance. _______________________________________________ > Asterisk-Users mailing list > [email protected] > http://lists.digium.com/mailman/listinfo/aster> isk-users > To > UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users _______________________________________________ Asterisk-Users mailing list [email protected] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
