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VoiceFinder AP2120 VoIP Gateway User’s Guide Version 1.00
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flexibility.
Each CODEC provides a certain quality of speech. The quality of transmitted
speech is a subjective response of the listener. A common benchmark used to
determine the quality of sound produced by specific CODECs is the mean
opinion score (MOS). With MOS, a wide range of listeners judge the quality of a
voice sample (corresponding to a particular CODEC) on a scale of 1 (bad) to 5
(excellent). The scores are averaged to provide the mean opinion score for
that sample. Table 5-1shows the relationship between CODECs and MOS
scores
Compression
Method
Bit Rate
(kbps)
Processing
(MIPS)
Framing
Size
MOS Score
G.711 PCM 64 0.34 0.125 4.1
G.729 CS-ACELP 8 20 10 3.92
G.729a CS-ACELP 8 10.5 10 3.7
G.723.1 MP-MLQ 6.3 16 30 3.9
G.723.1 ACELP 5.3 16 30 3.65
[Table 5-1Compression Methods and MOS Scores]
Although it might seem logical from a financial standpoint to convert all calls to
low-bit rate CODECs to save on infrastructure costs, you should exercise
additional care when designing voice networks with low-bit rate compression.
There are drawbacks to compressing voice. One of the main drawbacks is
signal distortion due to multiple encoding (called tandem encoding). For
example, when a G.729 voice signal is tandem encoded three times, the MOS
score drops from 3.92 (very good) to 2.68 (unacceptable).
Another drawback is CODEC-induced delay with low bit-rate CODECs.
There
are two kinds of delay inherent in today's telephony networks: propagation
delay and handling delay. Propagation delay is caused by the characteristics
of the speed of light traveling via a fiber-optic-based or copper-based media.
Handling delay (sometimes called serialization delay) is caused by the devices
that handle voice information. Handling delays have a significant impact on
voice quality in a packetized network.
- VoiceFinder 1
- [ Contents ] 3
- About this document 9
- AddPac Technology Co., Ltd 10
- [Symbols and Legends] 12
- Warning 12
- Caution 12
- VoiceFinder AP2120 VoIP 게이트웨이 15
- 1.2. Main Features 16
- 2.1. Unpacking 22
- 2.2. Parts and decriptions 24
- Rear View of AP2120 26
- AP-E&M8 31
- AP-FXS4O4 32
- 3.1. Installation 37
- 3.1.2. Console Connection 38
- Port Configuration Settings 39
- 4.1. Gateway Booting 48
- 1 router# 50
- 4.2. Commands 52
- Command Description 55
- Commands Description 56
- [Procedures] 63
- 4.4. Ethernet Configuration 65
- 4.4.2. PPPoE Configuration 70
- 4.5. Routing Configuration 79
- 4.5.2. RIP Configuration 84
- 4.5.3. OSPF Configuration 90
- 4 : permit ip any any 104
- Information 105
- [NAT Glossaries] 106
- [Procedure] 107
- Configuration 115
- [Procedure-DHCP Server] 117
- Optional Commands 118
- DHCP Type = RELAY 121
- Next Server = 151.1.12.1 121
- 4.10. Traffic Management 129
- 4.11. SNMP Configuration 135
- Send a message 138
- Send a message indicating 138
- 4.13.1. Logging Command 148
- 4.13.2. Show commands 149
- 4.13.3. Debug Commands 153
- File Management 156
- 4.14.2. Password Recovery 157
- 5.1.1. Voice Over IP 165
- There 167
- 5.1.3. Dial Peer 169
- 5.1.4. Voice ports 170
- IP Cloud 176
- Destination 176
- Voice Port 187
- 5.3.4.3. Call barring 188
- Step Command Description 196
- 60 PIN CONNECTOR 199
- RJ45_4PORT 199
- Exits configuration 207
- 5.7.2.1. dial-peer hunt 215
- 5.7.2.1.5. Example 216
- 5.7.2.2.1. Syntax 217
- 5.7.2.2.2. Default value 217
- 5.7.2.2.3. Command Mode 217
- 5.7.2.2.4. Usage Guideline 217
- 5.7.2.2.5. Example 218
- 5.7.2.3.1. Syntax 218
- 5.7.2.3.2. Default Value 219
- 5.7.2.3.3. Command Mode 219
- 5.7.2.3.4. Usage Guideline 219
- 5.7.2.3.5. Example 219
- 5.7.2.4. dial-peer voice 220
- 5.7.2.5. gateway 222
- 5.7.2.6. num-exp 223
- 5.7.2.6.5. Example 225
- 5.7.2.7. translation-rule 226
- 5.7.2.8. voice-port 227
- 5.7.2.8.5. Example 228
- 5.7.2.9.1. Syntax 228
- 5.7.2.9.2. Default Value 228
- 5.7.2.9.3. Command Mode 229
- 5.7.2.9.4. Usage Guideline 229
- 5.7.2.9.5. Example 229
- 5.7.2.10.1. Syntax 230
- 5.7.2.10.2. Default Value 230
- 5.7.2.10.3. Command Mode 230
- 5.7.2.10.4. Usage Guideline 230
- 5.7.2.10.5. Example 230
- 5.7.2.11.1. Syntax 231
- 5.7.2.11.2. Default Value 231
- 5.7.2.11.3. Command Mode 231
- 5.7.2.11.4. Usage Guideline 231
- 5.7.2.11.5. Example 232
- 5.7.2.12. voice service 233
- 5.7.2.13. voip-interface 234
- 5.7.2.13.5. Example 235
- 5.7.3.1. comfort-noise 236
- 5.7.3.2. connection 237
- 5.7.3.2.5. Example 238
- 5.7.3.3.1. Syntax 238
- 5.7.3.3.2. Default Value 238
- 5.7.3.3.3. Command Mode 238
- 5.7.3.4. echo-cancel 239
- 5.7.3.5. input gain 240
- 5.7.3.5.4. Usage Guideline 241
- 5.7.3.5.5. Example 241
- 5.7.3.7. output gain 243
- 5.7.3.8. polarity-inverse 244
- 5.7.3.9. ring number 245
- 5.7.3.9.4. Usage Guideline 246
- 5.7.3.9.5. Example 246
- 5.7.3.10.1. Syntax 246
- 5.7.3.10.2. Default Value 247
- 5.7.3.10.3. Command Mode 247
- 5.7.3.10.4. Usage Guideline 247
- 5.7.3.10.5. Example 247
- 5.7.3.11.4. Usage Guideline 248
- 5.7.3.11.1. Syntax 248
- 5.7.3.11.2. Default Value 248
- 5.7.3.11.3. Command Mode 248
- 5.7.3.13.5. Example 251
- 5.7.3.14.1. Syntax 251
- 5.7.3.14.2. Default Value 251
- 5.7.3.14.3. Command Mode 251
- 5.7.3.14.4. Example 251
- 5.7.3.15.1. Syntax 252
- 5.7.3.15.2. Default Value 252
- 5.7.3.15.3. Command Mode 252
- 5.7.3.15.4. Example 252
- 5.7.3.18.2. Default Value 255
- 5.7.3.18.3. Command Mode 255
- 5.7.3.18.4. Usage Guideline 255
- 5.7.3.18.5. Example 255
- 5.7.3.19.1. Syntax 256
- 5.7.3.19.2. Default Value 256
- 5.7.3.19.3. Command Mode 256
- 5.7.3.19.4. Usage Guideline 256
- 5.7.3.19.5. Example 257
- 5.7.4. Dial Peer Commands 258
- 5.7.4.1. answer-address 258
- 5.7.4.2. codec 259
- 5.7.4.2.2. Default Value 260
- 5.7.4.2.3. Command Mode 260
- 5.7.4.2.4. Usage Guideline 260
- 5.7.4.2.5. Example 260
- 5.7.4.3.1. Syntax 261
- 5.7.4.3.2. Default Value 261
- 5.7.4.3.3. Command Mode 261
- 5.7.4.3.4. Usage Guideline 261
- 5.7.4.3.5. Example 261
- 5.7.4.4.1. Syntax 262
- 5.7.4.4.2. Default Value 262
- 5.7.4.4.3. Command Mode 262
- 5.7.4.4.4. Usage Guideline 262
- 5.7.4.4.5. Example 263
- 5.7.4.5. dtmf-relay 264
- 5.7.4.6. forward-digits 265
- 5.7.4.6.2. Default Value 266
- 5.7.4.6.3. Command Mode 266
- 5.7.4.6.4. Usage Guideline 266
- 5.7.4.6.5. Example 266
- 5.7.4.7. huntstop 267
- 5.7.4.8. port 268
- 5.7.4.9. preference 269
- 5.7.4.10. prefix 270
- 5.7.4.11. register 271
- 5.7.4.11.1. Syntax 272
- 5.7.4.11.2. Default Value 272
- 5.7.4.11.3. Command Mode 272
- 5.7.4.11.4. Usage Guideline 272
- 5.7.4.11.5. Example 272
- 5.7.4.12. sid 273
- 5.7.4.13. session target 274
- 5.7.4.14. polarity-inverse 275
- 5.7.4.16.1. Syntax 277
- 5.7.4.16.2. Default Value 277
- 5.7.4.16.3. Command Mode 277
- 5.7.4.16.4. Usage Guideline 277
- 5.7.4.17. vad 278
- 5.7.4.17.5. Example 279
- 5.7.4.18.1. Syntax 279
- 5.7.4.18.2. Default Value 279
- 5.7.4.18.3. Command Mode 279
- 5.7.4.18.4. Usage Guideline 280
- 5.7.4.18.5. Example 280
- Configuration Command 281
- 5.7.5.1. announcement 281
- 5.7.5.2. codec preference 282
- 5.7.5.3. counter 283
- 5.7.5.4. discovery 284
- 5.7.5.5. fax protocol 285
- 5.7.5.6. fax rate 286
- 5.7.5.6.2. Default Value 287
- 5.7.5.6.3. Command Mode 287
- 5.7.5.6.4. Usage Guideline 287
- 5.7.5.6.5. Example 287
- 5.7.5.7. h323 call start 288
- 5.7.5.8. gkip 289
- 5.7.5.9. h323 call channel 290
- 5.7.5.9.1. Syntax 291
- 5.7.5.9.2. Default Value 291
- 5.7.5.9.3. Command Mode 291
- 5.7.5.9.4. Usage Guideline 291
- 5.7.5.9.5. Example 291
- 5.7.5.10.1. Syntax 292
- 5.7.5.10.2. Default Value 292
- 5.7.5.10.3. Command Mode 292
- 5.7.5.10.4. Usage Guideline 292
- 5.7.5.11. h323-id 293
- 5.7.5.12. lightweight-irr 294
- 5.7.5.13. max-digits 295
- 5.7.5.14. password 295
- 5.7.5.15. public-ip 296
- 5.7.5.16. register 297
- 5.7.5.17. rule 298
- 5.7.5.17.1. Syntax 299
- 5.7.5.17.2. Default Value 299
- 5.7.5.17.3. Command Mode 299
- 5.7.5.17.4. Usage Guideline 299
- 5.7.5.17.5. Example 300
- 5.7.5.18.1. Syntax 301
- 5.7.5.18.2. Default Value 301
- 5.7.5.18.3. Command Mode 301
- 5.7.5.18.4. Example 301
- 5.7.5.19.1. Syntax 302
- 5.7.5.19.2. Default Value 302
- 5.7.5.19.3. Command Mode 302
- 5.7.5.19.4. Usage Guideline 302
- 5.7.5.20. timeout 303
- 5.7.5.20.2. Default Value 304
- 5.7.5.20.3. Command Mode 304
- 5.7.5.20.4. Usage Guideline 304
- 5.7.5.20.5. Example 304
- 5.7.6.1. clear h323 call 307
- 5.7.6.2. clear voice port 308
- 5.7.6.3. show call active 308
- 5.7.6.4.2. Default Value 310
- 5.7.6.4.3. Command Mode 310
- 5.7.6.4.4. Usage Guideline 310
- 5.7.6.4.5. Example 310
- 5.7.6.5.1. Syntax 310
- 5.7.6.7. show dial-peer 312
- 5.7.6.10. show gateway 314
- 5.7.6.11. show num-exp 315
- 5.7.6.13. show user-class 317
- 5.7.6.14. show voice port 318
- 5.7.6.16. debug voip call 320
- 5.7.6.17. debug voip 321
- A-2 LAN/WAN Service 325
- ITEM Specification Remark 327
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