Chapter 7

Advanced ISDN

This chapter provides information about using advanced ISDN for the Model XM128 ISDN Digital Modem.

Call Control for DSS1

In order to initiate a Digital Subscriber Signaling #1 (DSS1) ISDN call, two information elements are necessary:

The bearer capability element indicates what kind of bearer service is desired. It is also used for compatibility checking in the addressed entity.

The called party number element provides necessary information for the telephone company central office (CO) to direct the call to the destination.

The following optional information elements are also pertinent to call control:

High-layer compatibility

Low-layer compatibility

Calling party number

Called party number

Calling party subaddress

Called party subaddress

Advanced ISDN

7-1

Page 69
Image 69
NETGEAR XM128 ISDN manual Chapter Advanced Isdn, Call Control for DSS1