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ISDN is supported on the Sonus SBC 1000/2000 DS1 interface. Each DS1 interface can be configured for T1 or E1. Sonus SBC 1000/2000 supports both "ISDN to ISDN" and "ISDN to/from SIP" calls.

Sonus SBC 1000/2000 Supports ISDN PRI trunks with the following ISDN variants:

Table : Specifications Supported

ISDN PRI Trunk/VariantBased on Specification
Q.SIGECMA-143 4th Edition December 2001
EuroISDNETS 300 102-1 December 1990
Nortel DMS-100

Northern Telecom Primary Specification BCS 36 ISDN Primary Rate User-Network Interface

NIS A211-1 Release 6, March 4, 1994

National ISDN Number 2 (NI-2)SR-4994 Issue 1 December 1999
AT&T 4ESS-
AT&T 5ESSTR41459 June 1999
NTT INS NET 1500-