I had been given a pair of Pantronics 400DSP headphones. Not my favorites as I like cans. The Plantronics let in too much exterior noise.
Well, after two months of use they gave up the ghost. The left channel dropped out. I’m going to bite the bullet, spend the $20 and order the bluetooth module for my computer. That way I can use my Motorola S9’s which are fairly reliable.
So if you are shopping for headphones to work with VoIP I can tell you to avoid the Plantronics crap. And it is crap.