40
C
HAPTER
2: S
YSTEM
S
ETTINGS
When the system negotiates which codec to choose, the process starts
from the top of the list and queries devices to discover if they support the
codec. If the device is supported, the system chooses the codec;
otherwise, the system goes on to the next codec in the list and initiates
the query process.
Codecs and NBX
Devices
Codecs reside on the NBX devices — telephones, analog terminal
adapters, and so forth. Some older devices do not support the latest
codecs. Therefore, during call setup, NBX devices negotiate an encoding
scheme that both devices (or all devices on a conference call) support.
Table 11
lists each device that must encode or decode audio, and shows
how each device supports the available codecs. Certain devices are
marked “N/A” for the G.722 codecs because those codecs are for
wideband audio, which is not supported by wide area networks or across
the PSTN.
Table 11
Audio Encoding Supported by NBX Devices
Device
Part Number
G.729
ADPCM G.711
G.722
G.722.2 G.722.2LB
3Com 1102, 2102, and 2102-IR
Business Telephones
3C10121 3C10122
3C10226A
3C10228IRA
No
Yes
Yes
No
No
No
3C10226PE
3C10226B
3C10228IRPE
3C10228IRB
3C10281PE
3C10281B
Yes
Yes
Yes
No
No
No
3Com 2101 Basic Telephones
3C10248PE
3C10248B
Yes
Yes
Yes
No
No
No
3Com 3100 Entry Telephone
3C10399A
Yes
Yes
Yes
No
No
No
3Com 3101, and 3101SP Basic
Telephones
3C10401A
3C10401SPKRA
Yes
Yes
Yes
No
No
No
3Com 3101B Basic Telephone
3C10401B
Yes
Yes
Yes
Yes
Yes
Yes
3Com 3101SPB Basic Telephone
3C10401SPKRB
Yes
Yes
Yes
Yes
Yes
Yes
3Com 3102 Business Telephone
3C10402A
Yes
Yes
Yes
No
No
No
3Com 3102B Business Telephone 3C10402B
Yes
Yes
Yes
Yes
Yes
Yes
3Com 3103 Manager’s
Telephone
3C10403A
Yes
Yes
Yes
Yes
Yes
Yes
3Com 3106C and 3107C
Cordless Telephones
3C10406C
3C10407C
Yes
Yes
Yes
No
No
No
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: ......