
Appendix B ISDN overview 711
BCM 4.0 Telephony Device Installation Guide
• Layer 3: Also a logical connection between the ISDN network (your service provider) and the
BCM system. For BRI lines, layer 3 is where call processing and service profile identifier
(SPID) information is exchanged. This controls which central office services are available to
the connection. For example, a network connection can be programmed to carry data calls.
The three layers mentioned above is important when you are installing, maintaining, and
troubleshooting an ISDN system.
ISDN bearer capability
Bearer capability describes the transmission standard used by the BRI or PRI line so that it can
work within a larger ISDN hardware and software network.
The bearer capability for BRI and PRI is voice/speech, 3.1 kHz audio (fax), and data (unrestricted
64 kbps, restricted 64 kbps, or 56 kbps).
Services and features for ISDN BRI and PRI
As part of an ISDN digital network, your system supports enhanced capabilities and features,
including:
• faster call set up and tear down
• high quality voice transmission
• dial-up Internet and local area network (LAN) access
• video transmission
•network name display
• name and number blocking (PRI, BRI and analog)
• access to public protocols
Refer to the following for additional information on features and services:
• “Network name display” on page 713
• “Name and number blocking (ONN)” on page 713
• “Call by Call Service Selection for PRI” on page 713
• “Emergency 911 dialing” on page 714
• “2-way DID” on page 715
• “Dialing plan and PRI” on page 715
PRI services and features
The services and features provided over PRI lines include:
Note: Throughout this chapter, references are made to Service profile
identifiers (SPIDs). SPIDs are a part of the BRI National ISDN standard.
SPIDs are not used in the ETSI BRI standard or on PRI.
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