Panasonic NS1000 The Panasonic NS1000 telephone system is a SIP business communication server supporting up to 1,000 SIP users and 256 SIP trunks per cabinet, deployable across multiple sites. The Panasonic NS1000 can provide a single network for up to 8,000 users. SIP based solutions are rapidly gaining in popularity amongst large businesses; now, the Panasonic NS1000 brings all the advantages of SIP to small and medium businesses and organisations.