VoIP Codecs
Codecs are used to change analog data into digitally encoded files that can be sent through the internet before eventually being decoded back into its original format that the recipient can then see/hear. Each codec uses it's own unique technique to convert the data, and as a result, codecs used for VoIP will vary according to the quality of sound preserved, the amount of bandwidth required to send the files, and the number of resources required in order to make the conversion.

The following is a chart of some of the codecs currently available for VoIP encoding:

- Codec Chart -
Codec	Algorithm	Bit Rate (Kbps)
GIPS Family		13.3+
GSM-Half Rate	CELP-VSELP	11.4
GSM-Full Rate	RPE-LTP	13
GSM-Enhanced Rate	ACELP	12.2
ILBC	Internet Low Bitrate Codec	13.33 & 15.20
ITU G.711	PCM	64
ITU G.722	SBADPCM	48, 56, & 64
ITU G.723	Multi-rate Coder	5.3 & 6.4
ITU G.726	ADPCM	16, 24, 32, & 40
ITU G.728	LD-CELP	16
Speex	CELP	2.15-44.2
LPC10		2.5
DoD FS-1016	CELP	4.8