SIP User's Manual
6
.
Configuring
the MediaPack
Version 2.4
159
June 2008
Table
6-6: ISDN Interface Parameters
Parameter
Description
Add TON to called number
[no] add-ton-as-prefix add-
to-called
If enabled, the TON from the Called Number of the incoming call is added to the
destination number as a prefix.
Adding the TON will precede the number manipulation.
Default: disabled
Note:
if more than one prefix is enabled, see Section
936H
6.2.2.4 “
937H
Order of Prefixes” on
page
938H
81 for order of prefixes.
Route First
[[no ]route-before-incoming]
If enabled, the call routing is performed before the number manipulation.
Default: disabled
Configuring ISDN Interface using CLI
To change the ISDN Interface parameters using CLI:
6.
Log on to the system.
7.
From the main configuration mode, change to the “context cs” mode.
8.
Form the “context cs” mode, change to the “interface pstn” mode.
9.
To enter the “interface pstn” mode, use the command:
interface pstn
<0..3>
The last number indicates the interface number.
10.
Use the commands in square brackets to change the parameters.
6.2.2.4 Order of Prefixes
For ISDN to SIP calls, the prefixes will appear in the following order:
1. Port
2. B-Channel
3. NPI
4. TON
6.2.2.5 LineHunting Logic
ISDN Line hunting is achieved by aggregating several ISDN ports into one ISDN interface.
As described above, each ISDN port binds to an ISDN interface. If several ports bind to the
same ISDN interface, the ISDN interface selects a port with a free channel based on the
hunt logic defined in the ISDN interface. Note that hunt logic operates on ports and not on
B-channels. A port is considered non-free if there is no free channel on that port. And it is
considered free if there is at least one free channel.
The illustration below shows an example of an IP-to-ISDN call. The IP-to-Tel Call Routing
table (refer to Section '
895H939H
IP to Tel Routing Table
' on page
896H940H
91
) determines the ISDN interface.
The ISDN interface selects a B-channel on an available ISDN port.
