We couldn't possibly make it any clearer.

Newly developed Ooma PureVoice HD technology gives you free U.S. calling with the utmost voice clarity.

Hear it for yourself in these audio samples.

Here's how the magic happens:

• 
  Wire-speed QoS

  Even though Ooma uses only a fraction of the bandwidth of standard VoIP technology, the little bandwidth it needs, it needs absolute priority for. Ooma can prioritize voice packets without slowing down the rest of your network. This way you can enjoy crystal clear calls even as you're uploading your latest video clips.

• 
  Advanced voice compression

  Ooma uses an advanced voice compression algorithm that reduces bandwidth consumption by 60% over standard VoIP technology. That leaves you with more bandwidth for all your other online activities.

• 
  Encrypted calls

  Ooma takes your privacy seriously. We use the same encryption technology governments use to protect classified data (that would make Ooma even safer than your old landline).

• 
  Adaptive redundancy

  Packet loss is the enemy of VoIP – it can cause voice to sound stuttered or garbled. Ooma can detect packet loss on your Internet connection before you even hear it and automatically deploy redundant packets to boost the clarity of your phone call.

• 
  HD Voice

  HD Voice technology actually doubles the fidelity of your phone calls by capturing twice the speech information of a standard voice call (yes, that includes your landline). When you and the other caller use an Ooma handset, or any HD compatible phone, your voice will sound more natural than ever. Why put up with the inferior quality of standard definition calls when you can upgrade to HD?

• 
  HD Capable Phones

  Most corded phones are HD capable. Here's a partial list:

  • AT&T Models 210, 983, 993, TR1909, CL2909, CL2939
  • Panasonic Models KX-TS105 (W and B), KX-TS208(W and B), KX-TS3282(W and B)
  • RCA Model 25201RE1
  • Uniden Models CEZ200, CEZ260, 1100, 1260, 1360, 3162