Polycom HD Voice technology delivers more than twice the clarity of ordinary phone calls for life-like, vibrant conversations. It's like switching from AM radio to CD-quality audio. The difference is so astounding, you will never want to go back to regular phone calls. You'll eliminate misunderstandings and save time simply by hearing every word clearly. And you'll avoid the frustration you experience with poor quality phone calls. Polycom Acoustic Clarity technology combines next generation industry-leading full duplex, echo cancellation, and noise reduction with advanced voice processing to give you the superior quality audio experience you expect from Polycom.