Nortel Meridian 1 Administration And Maintenance page 259

Chapter 6 — ISDN BRI trunk implementation
1TR6 local exchange connectivity
1TR6 local exchange connectivity provides 2B+D connectivity to a local
exchange that supports 1TR6 protocol via an S/T interface. The ISDN BRI
1TR6 local exchange connectivity provides the following basic call and
supplementary services:
Note: Support for any feature is dependent upon the terminal equipment
being used.
— Basic call service
— Circuit switched voice and data on the B-channel
— Calling Line Identification Presentation and Restriction
— Connected Number Delivery
— support for TIE, COT, DID, DOD trunk types
— 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.
— Overlap sending
— Flexible Numbering Plan
— Indication of Call Charging to the calling party
— Network-wide interworking with ISDN BRI ETSI terminals
Option 11C ISDN BRI Administration and Maintenance
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