3com MSR 20-20 참조 매뉴얼

generated, the toneless intervals will make both parties in conversation feel 
uncomfortable.

line and vad-on.

# Disable comfortable noise function on subscriber line 1/0.

<Sysname> system-view

[Sysname] voice-setup

[Sysname-voice] subscriber-line 1/0

[Sysname-voice-line1/0] undo cng-on 

compression { 1st-level | 2nd-level | 3rd-level | 4th-level } { g711alaw | g711ulaw | 
g723r53 | g723r63 | g726r16 | g726r24 | g726r32 | g726r40 | g729a | g729r8 }

undo compression { 1st-level | 2nd-level | 3rd-level | 4th-level }

POTS/VoIP/VoFR entity view

1st-level: Specifies a codec with the first priority.

2nd-level: Specifies a codec with the second priority.

3rd-level: Specifies a codec with the third priority.

4th-level: Specifies a codec with the fourth priority (namely, the lowest priority).

g711alaw: G.711 A-law codec (defining the pulse code modulation technology), 
requiring a bandwidth of 64 kbps, usually adopted in Europe.

g711ulaw: G.711

μ-law codec, requiring a bandwidth of 64 kbps, usually adopted 

in North America and Japan.

g723r53: G.723.1 Annex A codec, requiring a bandwidth of 5.3 kbps.

g723r63: G.723.1 Annex A codec, requiring a bandwidth of 6.3 kbps.

g726r16: G.726 Annex A codec. It uses the adaptive differential pulse code 
modulation (ADPCM) technology, requiring a bandwidth of 16 kbps.

g726r24: G.726 Annex A codec. It uses ADPCM, requiring a bandwidth of 24 
kbps. The support for the g726r24 keyword varies with devices.

g726r32: G.726 Annex A codec. It uses ADPCM, requiring a bandwidth of 32 
kbps. The support for the g726r32 keyword varies with devices.

g726r40: G.726 Annex A codec. It uses ADPCM, requiring a bandwidth of 40 
kbps. The support for the g726r40 keyword varies with devices.

g729a: G.729 Annex A codec (a simplified version of G.729), requiring a 
bandwidth of 8 kbps.