Private telephone system with unified command feature
作者： Roderick Bruce Story , Christopher David White , Albert George Offers
DOI:
关键词:
摘要: A key telephone system, having ports for connection to lines of a exchange and terminal apparatus including sets, is provided with the ability distinguish if an intended call or feature access involves more than system. If so, signalling protocol emulated on behalf transmitted via one whereby progress continues, as user had initiated exchange.
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