ISDN Protocol Administrator's and Developer's Guide ... - Intervoice

DPNSS 1 Network StructureDPNSS 1 refers to the Digital Private Network Signaling SystemNumber 1 as defined in the British Telecom Standard BTNR 188. ADPNSS 1 network is comprised of a number of nodes connected byDPNSS 1 signaling links. Some nodes provide access to a number ofdifferent types of non-DPNSS 1 interfaces, which are considered to beusers of the DPNSS 1 network and are differentiated by category, suchas, Ordinary Extension, Operator, or PSTN.DPNSS 1 nodes can be either PBXs within a private network or publicexchanges that provide business communications network capability inthe form of Virtual Private Networks (VPN) and Centrex.A PBX may be marked as supporting DPNSS 1, yet may offer nosupplementary facilities other than the ability to perform simpletelephone class tasks. Vendors claiming to support DPNSS 1 shouldstate which of the supplementary services defined in BTNR aresupported.The Omvia Media Server is considered a DPNSS 1 user and isconnected to a PBX, which acts as the end function of the network.6-8 ISDN Protocol Administrator’s and Developer’s Guide 60001262, First Edition