The support for DPNSS as BT's own signaling protocol also differentiated BT's private circuit’s services from those of its emerging rival Mercury Communications.
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DPNSS was an active (and successful) collaboration between PBX manufacturers and BT which started relatively slowly (BT & Plessey) but quickly snowballed with MITEL, GEC, Ericsson, Philips and eventually Nortel all joining to create a powerful and feature rich protocol.
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