Are there any accepted norms for a number for extension in asterisk?

Question

Asterisk

I create new users, and I seem to know that from 600 to 700 this is for groups, but I don’t know anything else. Are there any accepted norms for numbers in asterisk?

Answer 1

Already learned - do not do it on 6, on 7,8,9 and 0
7 - call parking
8 - it is clear that intercity and cellular
0 - old emergency services
I would also advise not to do it on 1, because of the rescue service on 112
If there are a lot of subscribers , do 4-digit numbering

Answer 2

Actually not using 6,7,8,9,0 is wrong. You can make internal ones that will begin with these numbers. Asterisk also looks at the length of the number.
Those. 1120 is not 112 at all.
For example, I root 8.9 for external calls. I teach people to E.164. And I plan the internal scheme based on the needs of the company and taking into account scaling.
I turn off parking in 99%. Nobody uses her.