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Audio Settings
41
Silence Suppression
Overview
Silence suppression is a method of reducing the number of packets
transmitted during a conversation. Silence suppression can help you avoid
dropped packets on a congested network. During a conversation there
are periods of silence. A packet of silence takes up as much bandwidth as
a packet with audio data. If you enable Silence Suppression, the
telephone sends a
silence indicator
when it senses the start of a silent
period and it suppresses all subsequent voiceless frames. When another
NBX device receives this indicator, it generates and inserts white noise
until it receives the next frame that contains audio data. If you enable
Silence Suppression, a careful listener might notice a difference in audio
quality. The background white noise generated by the receiving
telephone is subtly different from the silence in an audio stream.
Silence suppression results in compromises to audio quality. Do not
enable suppression unless you are trying to solve network bandwidth
congestion issues that you cannot solve through other means, such as
increasing network capacity.
To enable Silence Suppression, click
System-Wide Settings > Audio
Settings
.
3Com 3108 Wireless Telephone
3C10408A
Yes
Yes
Yes
No
No
No
Analog Terminal Adapter
3C10120
3C10120B
No
Yes
Yes
N / A
N / A
N / A
3C10400
Yes
Yes
Yes
N / A
N / A
N / A
Analog Terminal Card
3C10117
3C10117B-INT
No
Yes
Yes
N / A
N / A
N / A
3C10117C
Yes
Yes
Yes
N / A
N / A
N / A
Analog Line Card
3C10114
3C10114-ANZ
No
Yes
Yes
N / A
N / A
N / A
3C10114C
Yes
Yes
Yes
N / A
N / A
N / A
Digital Line Card
3C10116,
3C10116B
3C10116C
3C10164-ST (BRI)
3C10164C-ST (BRI)
3C10165
3C10165C
No
Yes
Yes
N / A
N / A
N / A
3C10116D
3C10165D
Yes
Yes
Yes
N / A
N / A
N / A
Table 11
Audio Encoding Supported by NBX Devices (continued)
Device
Part Number
G.729
ADPCM G.711
G.722
G.722.2 G.722.2LB
Summary of Contents for 3C10402B
Page 18: ...18 ...
Page 22: ...22 ABOUT THIS GUIDE ...
Page 26: ...26 CHAPTER 1 INTRODUCTION ...
Page 74: ...74 CHAPTER 3 FEATURE SETTINGS ...
Page 130: ...130 CHAPTER 5 TELEPHONE CONFIGURATION ...
Page 156: ...156 CHAPTER 7 CALL DISTRIBUTION GROUPS ...
Page 194: ...194 CHAPTER 8 PSTN GATEWAY CONFIGURATION ...
Page 256: ...256 CHAPTER 10 SIP MODE OPERATIONS ...
Page 328: ...328 CHAPTER 11 DIAL PLAN ...
Page 360: ...360 CHAPTER 13 DOWNLOADS ...
Page 370: ...370 CHAPTER 14 LICENSING AND UPGRADES ...
Page 406: ...406 CHAPTER 16 NETWORK MANAGEMENT ...
Page 412: ...412 CHAPTER 17 COUNTRY SETTINGS ...
Page 450: ...450 APPENDIX A INTEGRATING THIRD PARTY MESSAGING ...
Page 456: ...456 APPENDIX B ISDN COMPLETION CAUSE CODES ...
Page 510: ...510 APPENDIX F OUTBOUND CALLER ID AND 911 SERVICE ...
Page 546: ...546 APPENDIX G NBX ENTERPRISE MIB ...
Page 566: ...566 GLOSSARY ...
Page 578: ...578 INDEX ...
Page 582: ......