Audio quality is fair, with noticeable background noise. NetMeeting's default settings make the CELP algorithm the codec of last resort, and we understand why. G7231QN.wav Quicknet Technologies Internet LineJACK provides excellent quality when used with Quicknet's own H.323 application. It does this by offloading audio processing from the PC's CPU and performing digitization, echo cancellation, compression, and packetization in parallel. G711QN.wav Quicknet's G.711 codec delivers excellent quality, indistinguishable to our ears from a regular PSTN call.
Voices sound natural and line noise is low.
If your network is suffering, your audio will suffer too. It's one thing to demonstrate voice over IP service when the network is clean, and quite another matter in the real world - where delay variation and packet loss can kill audio quality. While no codec can deliver toll quality when packet loss is high, the G.711 codec doesn't degrade as quickly when your network deteriorates. Neither sounds clean, but G.711 is slightly better. Note the twangy, metallic edge on the G.723.1 call.