ICX 500 Gateway
Doc.no.A100K12202
Page 92
The different options calling out on a SIP trunk:
Dialling method
Dial
Directory
No
Feature
Parameter 2
Comment
Prefix (overlap
dialling):
0 +
571234
0
83
0
Digits are sent one by one from
AlphaCom (SIP INFO / RFC4733)
Prefix (enbloc
dialling):
0 +
571234
0
81
6
Collect up to six digits in AlphaCom, then
send the complete number
(*)
Integrated prefix
(enbloc dialling):
57 +
1234
57
83
4
Collect up to four digits, then send
number as one number
(*)
Global number
(enbloc dialling):
571234 571234
83
0
Send the complete number. Maximum 8
digit number.
SIP Trunk Station
(enbloc dialling):
571234 571234
9
NA
Send the complete number. Maximum 8
digit number.
(*): Up to 32 digits can be collected before the SIP INVITE is sent. In software version 11.2.3.9
and earlier, the maximum number of digits was 16.
7.2.3.1. Prefix number (overlap dialling)
When overlap dialling is used (also called "two-stage dialling"), the SIP Device seizes one of
the PSTN/PBX lines without performing any dialling, connects the ICX-500 station to the
PSTN/PBX, and all further signalling (dialling and Call Progress Tones) is performed directly
with the PBX without the SIP device's intervention. The digits are sent to the SIP device either
as SIP INFO messages or as RFC4733, depending on the SDP negotiation.
The directory number must be programmed in the ICX-500 directory table with feature 83 and
Node = SIP Trunk node number.
Prefix number is 0, calling SIP trunk node 100, using overlap dialling
