ISDN Configuration

- used to configure ISDN settings. It is just available if ISDN hardware is installed and detected otherwise, it’s greyed out.

ISDN configuration dialog:

D-channel protocol:

The following D-channel protocols may be selected:

- DSS1 (Euro ISDN):        ISDN standard in whole Europe

- NI1:                                used in North America

- 5ess:                                used in North America

- Jate:                                used in Japan

- VN4:                                an old national French D-channel protocol (expiring)

- Austel:                        an old national Australian D-channel protocol (expiring)

- DSS1 (ext):                        the DSS1 standard, with small modifications for Taiwan

D-channel depending settings

Part of the ISDN configuration dialog, it’s context sensitive to the selected D-channel protocol:

DSS1, DSS1 (ext.), VN4

The user can set the MSN (Multiple Subscriber Number) to which will respond.

There are generally only two reasons to use an MSN:

- if multiple devices with the same service using one ISDN bus

- if is attached to PBX (Private Branch exchange)

If a single is connected to an externally-provided S0, it’s not necessary to add an MSN.

NI1, 5ess

With the both North American protocols NI1 and 5ess it is mandatory to enter an ID and a SPID (=service profile identifier). These informations are supplied by the ISDN service provider.

Note:

There are still some ISDN lines which use 56kb/s per B-channel, rather than 64kb/s: however, they are mainly in North America!

Jate, Austel

With both the Jate and Austel protocols, you MUST enter an ID.

Common Settings

The following settings are available for all protocols:

Get dialtone

When is connected to a PBX or ISDN switch, it is often necessary to add a number for external access (e.g. 9). Enter the number required via this dialog.

Note:

This number precedes EVERY dialled number - even those ‘dialled’ using the Connect or Phonebook buttons on the ‘wheel’ symbol displayed in the Remote Control program window.

Predial No.

Sometimes it is necessary to use a special provider to guarantee the quality of the ISDN service or the carriage of ISDN calls through a Gateway. Usually a special provider can be selected by dialing a special call-by-call number before the normal number.

This Predial Number precedes EVERY dialled number - whether it is dialled by the Connect or Phonebook buttons, and is inserted AFTER the number supplied by Get Dialtone.

Min. Digits for. Ext. Call

- determines the number of digits BEFORE the Get Dialtone number becomes valid.

For example:

- Get dialtone:                9

- Min. Digits for Ext. Call:        5

Entered number: 1234        Dialed number: 1234

Entered number: 01234        Dialed number: 901234

Timeout

- sets the interval time between Redial attempts (measured in seconds).

Note:

You can enter values other than those listed, although the maximum value is 65,535 seconds

Redial

- defines the number of Redials which will be attempted.

A Redial will occur if the other party cannot be reached either through being busy, if there’s no response, or if the other party disconnects/drops the call.

Note:

You can enter values other than those listed, but the maximum possible value is 65,535 attempts.

Audio delay

- sets the audio delay applied to the ISDN interface. The maximum value is 5,000 ms.
Increasing this value can make ISDN connections more stable, by providing a larger (longer) buffer. For instance the audio delay buffer can compensate jitter.