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BASIC CONFIGURATION | 27
Click on the Telco menu. With ISDN modules installed in both Telco interface positions, 2.
you will see a page similar to the one below.
Choose the ISDN Protocol. For the USA and Canada, this will usually be Natl.I-1. For 3.
Europe and much of the rest of the world, it will be ETS300.
For Natl.I-1, enter the SPIDs for each voice channel given to you by the telephone 4.
company. Leave this blank for other protocols.
Enter the DN (Directory Number) or MSN for each voice channel. e DNs, sometimes 5.
called Listed Directory Numbers or LDNs, are your (usually 7-digit) phone number as
listed in the telephone directory. ey normally do not include the area code.
In some cases, you may need to enter 10 digits for your DNs. If you have difficulties with 6.
incoming calls, try this.
Click 7. Apply, then Reboot Now to activate the ISDN circuits.
Tip
Each ISDN Line has a certain ISDN protocol (or ‘switch type’), which the phone company
should have given you. By far the most common protocols in the USA & Canada are National
ISDN-1 & National ISDN-2 in which case you should set the Telco setting to Natl.I-1.
If are in the USA or Canada and you do not know what protocol your line is congured for, try
Natl.I-1 rst. If that does not work, see Section 5.5 for hints on how to guess your protocol.