I purchased this headset to be used with my Linksys SPA941/SPA942 IP phones with Vocalocity VoIP service. I wanted to be able to talk on the phone while using a computer or walking around. This headset does this. No problems with the sound quality. The handset lifter works just fine. The only complaint I can think of is the advertised 300 foot range is wrong for me. It cuts out for me at about 100 feet. But I would still highly recommend this product.