Forwarding Calls to External

[PhoneNewbie]

I have a question regarding the following FAQ:

http://www.tek-tips.com/faqs.cfm?spid=799&sfid=2078

This is a silly question but how should destination codes be set up? Does it matter what number I choose aside from the fact that I have to enter that number later? I notice it won't let me pick a 7,8,9 as the first digit - any significance to that? I can forward calls externally now with F84 but would really like to have the IC lines go too. Thanks a lot for your help and sorry for such a basic question

 

[Roldan]

Your destination codes cannot conflict with:
Call Park Prefix
External Acces Code
Direct Dial Numbers
Line Pool Codes
Extension Numbers
Hunt Groups
This would be why your system won't allow you to use these digits. Your extension range must be kinda high like 600's or even 500's?