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VoIP

5

(VoIP) () . : , . .

Asterisk


Asterisk Pro

, /, , . , /.

, :

, /.
G.711 64 /.
G.726 16, 24, 32 40 / .
G.729 8 / .
GSM 13 / .
iLBC 13.3 / . (30 );
15.2 / . (20 )
Speex 2.15 22.4 / .
G.722 64 /.

G.711

G.711 (PSTN). - PCM. 2 ( ) G.711: µ A . 8 8 000 . 8 8 000, 64 000 64 /, , G.711.

, G.711 , (), : . G.711.

G.711 , , .


G.726

, G.721, , . - (Adaptive Differential Pulse-Code Modulation, ADPCM) . 16, 24 32 /.

G.726 G.711 , . , , . 1990 , . , .


G.729A

, G.729A, 8 /., . (Conjugate-Structure Algebraic-Code-Excited Linear Prediction, CS-ACELP). , ; G.729A .

, G.729A (CPU).


GSM

(Global System for Mobile Communications, GSM) , G.729A, 13 /. . , GSM G.729A.


iLBC

iLBC (Internet Low Bitrate Codec) . .

iLBC ITU , IP IP . (IETF) RFC 3951 3952 iLBC.

Internet Low Bitrate , , .

iLBC , , Global IP Sound (GIPS), . iLBC 13.3 /. 30 , 15.2 /. 20 .


Speex

Speex (variable-bitrate, VBR), . , .

Speex (Berkeley Software Distribution license, BSD). 2.15 22.4 /. .


G.722

G.722 ITU-T (International Telecommunication Union - Telecommunication sector) 1988 . G.722 , G.711 VoIP . G.722 , .


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