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Codecs Matter: Our Findings
The complete Codec/Application comparison chart. (acrobat)
In this chart we compare Hardware Assist, Rated Bandwidth, Processor Utilization and Quality over various network conditions.

Hear it for yourself:
Audio samples from our H.323 tests

Note regarding audio samples

These files are for comparison of audio codecs found in H.323 desktop clients. Because of the media conversion procedures used in preparing these samples, the audio quality is slightly lower than what you'd actually perceive during a call.

These samples were recorded directly from a Pentium Pro/200 MHz PC running Windows 98 and Microsoft NetMeeting or Quicknet Technologies' H.323 application. These samples were first recorded to analog cassette tape via a direct connection to the PC's sound board -- the Creative Technology SoundBlaster Live! Value adapter being used for NetMeeting samples, and the Quicknet Technologies Internet LineJACK for the Quicknet Samples.

These samples were then recorded as .WAV files via the SoundBlaster Live! Adapter using Creative WaveStudio 4.02. Tape hiss introduced by the recording technique was removed with FMAH's D/Noise 1.01d http://www.fmah.com and Pristine Sounds '98 http://www.pristinesounds.com., using identical filters for all samples.

All samples were recorded at the MCI WorldCom Developer's Lab in Richardson, TX MCI Lab