Nortel Meridian 1 Administration And Maintenance page 260

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553-3011-311 Standard 7.0
Chapter 6 — ISDN BRI trunk implementation
Numeris VN3 local exchange connectivity
The Numeris local exchange connectivity provides 2B+D connectivity
through an S/T interface to a local exchange that supports Numeris VN3
protocol. The ISDN BRI/Numeris VN3 local exchange connectivity provides
the following basic call and supplementary services:
— Basic call service
— Circuit switched voice and data on the B-channel
— Called/calling party subaddress (network-wide)
— 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.
— 64 kbps clear bearer capability
— Flexible Numbering Plan
— Advice of charge during call and at end of call
— Network-wide interworking with ISDN BRI Numeris terminals
May 1999