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Chapter 3 — DPNSS1/DASS2 features description and implementation Page 815 of 1536
ISDN to DPNSS1/DASS2 gateway
The ISDN to DPNSS1/DASS2 Gateway provides interworking between
DPNSS1/DASS2 and the following ISDN interfaces:
— ISDN BRI (line and trunk, Net-3 compliant);
— EuroISDN (ETS 300-102);
— ISDN QSIG (ETS 300-172);
— MCDN (NT proprietary PBX-PBX ISDN protocol).
The following features and capabilities are supported over the ISDN to
DPNSS1 gateway:
— Basic call service (3.1 kHz speech, 64K restricted/unrestricted data);
— Overlap sending and receiving;
— 64 kbps bearer capability;
— Data rate adaptation (in accordance with ETS 300-102, and in
compliance with BTNR 188 Section 7);
— Mapping of BTNR 189-I supplementary information service strings
within DPNSS1 messages.
Operating parameters
The feature has the following limitation:
— PSTN incoming trunks are not to be allowed access to PSTN outgoing
trunks
Feature packaging
— DPNSS1 Network Services (DNWK) package 231
— UIGW package 283
— Integrated Digital Access (IDA) package 122
— DPNSS1 package 123
— DASS2 package 124
— PRI2 package 154
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