Nortel Meridian 1 Administration And Maintenance page 270

Page 256 of 492
553-3011-311 Standard 7.0
Chapter 6 — ISDN BRI trunk implementation
QSIG is oriented towards signaling and services that occur between
peer-to-peer connectivity, that is, between two PBXs, between two Centrex,
or between a PBX and a Centrex; the signaling for services would be
exchanged across a "Q" reference point. Figure 42Figure 42 illustrates an
example of QSIG trunk connectivity. For ISDN BRI, the QSIG interface will
provide the following capabilities:
— Compliant Multi-vendor PBX/Centrex Private ISDN interworking
(connectivity between the Private ISDN PBXs may be via PRI or ISDN
BRI trunks)
— ETSI or ISO version of basic call service
— 64 kbps clear data
— Overlap Sending/Receiving
— Channel Negotiation
Note: in cases where several ISDN BRI trunks (and hence several
DSLs) are configured on a route, if Channel Negotiation fails to yield an
acceptable channel on any of these DSLs, it is not possible to use another
channel on another DSL.
— Calling Line Identification Presentation (CLIP)
— Calling Line Identification Restriction (CLIR)
— Connected Line Identification Presentation (COLP)
— Connected Line Identification Restriction (COLR)
— Flexible Numbering Plan
— Support for Tie trunk call types
— Transit Count information transmitted when ISDN Call Connection
Limitation (ICCL) is present (supported for ETSI QSIG only)
— Party Category (partially supported on ETSI QSIG)
May 1999