Grandstream Networks GXV3380 Administration Manual page 53

2. Grammar: x – any digit from 0-9;
a) xx+ or xx. – at least 2-digit numbers
b) xx – only 2-digit numbers
c) ^ - exclude
d) [3-5] – any digit of 3, 4, or 5
e) [147] – any digit of 1, 4, or 7
f) <2=011> - replace digit 2 with 011 when dialing
g) | - the OR operand
h) \+ - add + to the dialing number
i) , - play second dial tone.

Example 1: {[369]11 | 1617xxxxxxx}
Allow 311, 611, and 911 or any 10-digit numbers with leading digits 1617

Example 2: {^1900x+ | <=1617>xxxxxxx}
Block any number of leading digits 1900 or add prefix 1617 for any dialed
7-digit numbers

Example 3: {1xxx[2-9]xxxxxx | <2=011>x+}
Allow any number with leading digit 1 followed by a 3-digit number,
followed by any number between 2 and 9, followed by any 7-digit number
OR allow any length of numbers with leading digit 2, replacing the 2 with
011 when dialed.

Example 4: {0,x+}
If user dials 0 second dial tone will be played, and users can continue
entering digits. For instance, if pressing 01234, after pressing 0 second
dial tone is played, full number is sent in INVITE.
3. Default: Outgoing – { x+ | \+x+ | *x+ | *xx*x+ }
Allow any number of digits, OR any number with a leading +, OR any
number with a leading *, OR any number with a leading * followed by a 2
digits number and a *. To dial + from keypad, press on 0 until + appears
on LCD.
Example of a simple dial plan used in a Home/Office in the US:
{^1900x. | <=1617>[2-9]xxxxxx | 1[2-9]xx[2-9]xxxxxx | 011[2-9]x. |
[3469]11 }
Explanation of example rule (reading from left to right):

^1900x. – prevents dialing any number started with 1900

<=1617>[2-9]xxxxxx – allow dialing to local area code (617) numbers
by dialing 7 numbers and 1617 area code will be added automatically

1[2-9]xx[2-9]xxxxxx |- allow dialing to any US/Canada Number with 11
digits length

011[2-9]x. – allow international calls starting with 011
GXV3380 Administration Guide
Version 1.0.1.19
P a g e | 53