# PRI variants and specifications

The following table lists variants and specifications for the PRI
interface:

Network protocol variant | Specification
--- | ---
AT&T 4ESS (AT4) | TR 41459 (June 1999), PRI or BRI only
AT&T 5ESS10 (E10) | Custom now edited by LUCENT AT&T 235-900-342 (January 1996): PRI or BRI
Northern Telecom DMS-100 (DMS) | NIS A211-1 Standard 08.01: PRI or BRI
Bellcore National 2 (NI2) | SR-3887 (November 1996): PRI or BRI
France Telecom Euro ISDN and Euro Numeris (VN6) | ETS 300 102-1 (December 1990) + Addendum ETS 300 103-1/A2 (October 1993) CSE P 10-21A (June 1994): French deltas
NTT INS 1500 (NTT) | INS-NET-64 (March 1993)
Hong Kong (HKT) | HKTA 2015 Issue 1 (1996)
Korea (KOR) | Similar to ETS. There is no Korean specification, but ETSI specifications have been implemented in NMS ISDN with some changes requested by Korean Samsung.
Taiwan (TWN) | ME 0200-2 May 1997, edited by Chunghwa Telecom Co. Ltd.
Australia (AUS) | TS-013.1 1990 and TS-014.2 1990
Signaling at the Q reference point (QSIG) | ECMA 143 (June 1997)
ANSI T1.607 (ANSI) | T1.607-2000