Projekt
bring a smooth and satisfying VoIP communications experience.
Figure 4.The Zoiper' interface
Also it is necessary to choose the right audio codec for VoIP transmission which ensure us the
right quality of MOS from 3,5 to 4. In this case the best choice for us will be a G.729 codec a
speech codec, with the low-latency G.729 audio data-compression algorithm, which partitions
speech into 10-ms frames. It uses an algorithm called conjugate-structure ACELP (CS-ACELP).
G.729 compresses 16-bit signals sampled at 8 kHz via 10-ms frames into a standard bit rate of 8
kbps, but it also supports 6.4-kbps and 11.8-kbps rates. In addition, it supports voice-activity
detection and comfort-noise generation.
Video conferences are too important for our customer. For video codec we chose the default
H.261. This standard, developed in 1990, was the first widely used video codec. It introduced the
annaabi.ee 
