Voice Over IP, The Way It Should Be
January 11, 1999
By David Willis Voice over IP works, but it still has a long way to go before it's ready for the enterprise. If you're aiming to adopt VoIP at the campus level, proceed with caution; you'll need to exercise tight control, along with healthy provisioning, of every link and intermediate node. We tested a variety of products and show how you can improve conditions for a successful deployment.
Codecs Matter: Our Findings
Hear it for yourself:
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
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