Hello Direct is a Nashua based reseller of mostly headsets and POTS accessories. Early on, they competed with Polycom with headsets. In fact I do have one that is in my pile of junk. Their own products had 3.5mm plugs and jacks, while Plantronics had their RJ-9 connections.
But ironically, they were friendemies at some point in the 1990s. At one point, Hello Direct put their label against what would be to you and I, a Plantronics M10 amplifier, this was on the market at the same time Plantronics did.
I got this at the Savers thrift chain several years back.