AT&T DS1/DMi/ISDN-PRI manual 30INTRODUCTION

1-30INTRODUCTION

5.Interworking between ISDN-PRI and DCS is a complex issue that is beyond the scope of this document. However, for a combined ISDN-PRI/DCS network, several new ISDN feature and service options are available. These include:

●Call routing based on BC

●End-to-end ISDN connectivity routing

●BC passed on a call-by-call basis

●User-to-user information transport

●Locally provided tones

●Controlled initialization of trunks to in-service at provisioning time

●Two-way busy out of trunks

●Digital demand transmission test

6.Generally, DCS networks may overlay on an electronic tandem network (ETN) or main/satellite network. For DCS call routing, ETNs use AAR to complete DCS calls while main/satellite networks use multidigit steering software to complete DCS calls. Therefore, if DCS trunks are provided over ISDN-PRI facilities, then the switch must be configured with AAR. (See item 1 of this list for more information.)

7.DCS software requires that the calling-party number be part of a 4- or 5-digit uniform dial plan. The ISDN-PRI public-network dial plan uses a 10-digit format while the ISDN-PRI private-network dial plan uses a 7-digit format. Proper digit conversion (10- or 7-digit format to the 5- or 4-digit format required for DCS) is provided through the switch administration procedures.

8.When Generic 2 connects to a System 85 R2V4 using ISDN-PRI facilities to provide DCS service, then the originating extension will not receive display updates as the call progresses (for example, to call coverage or is forwarded). The DCS leave word calling feature is only applicable for 4- or 5-digit extension numbers; it will not function with 7- or 10-digit public- or private-network numbers.