ZyXEL Omni TA 128 User Guide - Page 86
Advanced ISDN Call, Control
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11 Advanced ISDN Call Control Call Control for DSS1 (Digital Subscriber Signaling #1) In order to initiate a DSS1 ISDN call, two information elements are necessary: • Bearer Capability - indicates what kind of bearer service is desired. It is also used for compatibility checking in the addressed entity. • Called Party Number - provides necessary information for the telephone company Central Office (CO) to direct the call to the destination. Other optional information elements which are pertinent to call control include: • High-Layer-Compatibility. • Low-Layer-Compatibility. • Calling-Party-Number. • Called-Party-Number. • Calling-Party-SubAddress. • Called-Party-SubAddress. Control of Outgoing Service Indicator The High-Layer-Compatibility and Low-Layer-Compatibility information provides a means for compatibility checking by the called party. They are transferred transparently by the ISDN 74