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{{technical|date=October 2017}}
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The '''Digital Private Network Signalling System''' ('''DPNSS''') is a [[network protocol]] used on digital [[trunk lines]] for connecting to [[PABX]]. It supports a defined set of inter-networking facilities.
DPNSS was originally defined by [[British Telecom]]. The specification for the protocol is defined in BTNR188. The specification currently comes under the Network Interoperability Consultative Committee.
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