ZyXEL ACCESSING INTERNET & INTRANET omni series Manual de usuario Pagina 91

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Advanced ISDN Call Control 79
12 Advanced ISDN Call
Control
Call Control for DSS1
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 network
between the call originating entity (e.g. the calling user) and the
addressed entity.
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