The Digital Private Network Signalling System (DPNSS) is a network protocol used on digital trunk lines for connecting two 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.
Read more about Digital Private Network Signalling System: History, Overview of The Protocol, Practical Considerations, DPNSS and VoIP, Criticisms
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