Sends an early INVITE each time a key is pressed when a user dials a number.
Otherwise, only one INVITE is sent after full number is dialed (user presses Dial Key or
after “no key entry timeout” expires). This option should be used only if there is a SIP
proxy is configured and supporting “484 Incomplete Address” responses. Otherwise, the
call will likely be rejected by the proxy (with a 404 Not Found error). Default is No.
This feature is NOT designed to work with and should NOT be enabled for direct IP-to-
IP calling.
Dial Plan Rules:
1. Accept Digits: 1,2,3,4,5,6,7,8,9,0 , *, #, A,a,B,b,C,c,D,d
2. Grammar: x - any digit from 0-9;
a. xx+ - at least 2 digits number;
b. xx – exactly 2 digits number;
c. ^ - exclude;
d. . – wildcard, matches one or more characters
e. [3-5] - any digit of 3, 4, or 5;
f. [147] - any digit 1, 4, or 7;
g. <2=011> - replace digit 2 with 011 when dialing
h. < =1> - add a leading 1 to all numbers dialed, vice versa will remove a
1 from the number dialed
i. | - or
• Example 1: {[369]11 | 1617xxxxxxx} –
Allow 311, 611, 911, and any 10 digit numbers of leading digits 1617
• Example 2: {^1900x+ | <=1617>xxxxxxx} –