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530 Appendix B Silence suppression
NN40020-603NN40020-603
Figure 146 One call on a half-duplex link without silence suppression
When silence suppression is enabled, voice packets are only sent when a speaker is talking. In a
typical voice conversation, while one speaker is talking, the other speaker is listening – a
half-duplex conversation. The following figure shows the peak bandwidth requirements for one
call on a half-duplex link with silence suppression enabled. Because the sender and receiver
alternate the use of the shared channel, the peak bandwidth requirement is equal to the full
transmission rate. Only one media path is present on the channel at one time.
Figure 147 One call on a half-duplex link with silence suppression
Tx
Rx
Hello Fred. this is Susan Do you have a minute?
Sure!Hi!Fred Here.
Conversation
Bandwidth used
Channel/Link max
Time
Voice frames sent even when speaker is silent
Tx + Rx Chan
Bandwidth
Conversation
Conversation
Hello Fred. this is Susan Do you have a minute?
Fred Here. Hi! Sure!
Conversation
Bandwidth used
Channel/Link max
Time
Voice frames sent even when speaker is silent
Tx + Rx Chan
Bandwidth
Tx
Rx
- BCM50 2.0 1
- Trademarks 2
- Contents 3
- Contents 17 17
- 18 Contents 18
- List of procedures 19
- 24 List of procedures 24
- Chapter 1 25
- Acronyms 26
- About BCM 26
- BCM features 27
- BCM applications 27
- Related publications 29
- Telephones and Peripherals 30
- Digital Mobility 30
- IP Telephony 30
- User Guides 30
- How to get Help 31
- Chapter 2 33
- DID system 34
- Basic telephony routing 35
- Private network parameters 37
- Keycode requirements 38
- Lines used for networking 39
- Toronto office 42
- New York office 42
- System dialing plans 43
- Routing for tandem networks 44
- Trunk Route Optimization 48
- Trunk Anti-tromboning 49
- ETSI Euro network services 51
- DPNSS 1 services 52
- DPNSS 1 capabilities 53
- DPNSS 1 features 53
- Three party service 54
- Making a conference call 55
- Using the diversion feature 55
- Executive intrusion 57
- Call Offer 58
- BRI Euro Protocol 61
- Naming convention 62
- Application level differences 62
- Protocol level differences 62
- Chapter 3 63
- Incoming calls 66
- Outgoing calls 70
- Chapter 4 73
- Changes pending 74
- IP set resources 74
- IP trunk resources 74
- Media gateway resources 74
- Chapter 5 77
- Chapter 6 81
- Module parameters list 83
- Chapter 7 87
- Trunk module metrics 88
- Chapter 8 89
- Active physical lines 90
- Target lines 91
- BRI loops programming 92
- Line record 93
- Line Job Aids 94
- Chapter 8 Lines overview 95 95
- Line pool tips 96
- Using loss packages 97
- Programming line access 98
- 100 Chapter 8 Lines overview 100
- NN40020-603NN40020-603 100
- Chapter 9 101
- Telephony Resources table 102
- Media bay module panels 104
- 460, or 106
- Interface levels 107
- Internal CSU 108
- Port details 110
- Table 17 Port Values tab 111
- IP telephones 112
- IP Terminal Global Settings 113
- IP telephone set details 114
- Voice over IP trunks 115
- Routing table 116
- H323 Settings 118
- H323 Media Parameters 122
- SIP Settings 125
- SIP Media Parameters 126
- SIP URI Map 127
- Figure 34 SIP URI Map tab 128
- Table 26 SIP URI Map Fields 128
- Chapter 10 129
- Trunk/Line data, main panel 130
- Properties 132
- Preferences (lines) 134
- Assigned DNs 138
- Figure 39 Add a DN record 139
- Chapter 11 141
- Chapter 12 145
- Configuring PRI line features 147
- Chapter 13 151
- Chapter 14 157
- Chapter 15 163
- Chapter 16 169
- Configuring DID line features 172
- Chapter 17 175
- •Networking 179
- Chapter 18 181
- Chapter 19 187
- T-loop general settings 189
- T-loop SPIDS and network DNs 190
- T-loops D-packet service 192
- S-loops assigned DNs 193
- Chapter 20 195
- Configuring BRI lines 197
- Chapter 21 201
- DN records: ISDN devices 202
- Prerequisites 203
- Chapter 22 205
- Programming incoming CLID 207
- Programming outgoing CLID 208
- Chapter 23 211
- Business name display 212
- Name display 213
- Chapter 24 217
- Creating dialing plans 218
- Private network dialing 221
- Outgoing call routing 222
- Outgoing public calls routing 223
- Incoming call routing 224
- Processing incoming calls 225
- 226 Chapter 24 Dialing plans 226
- Chapter 24 Dialing plans 227 227
- Extension 2246 228
- Extension 2280 228
- Understanding access codes 229
- Call Park codes 230
- Creating Direct Dial sets 231
- Tips about access codes 232
- Chapter 24 Dialing plans 233 233
- Line pool access codes 234
- Using Carrier codes 234
- Configuring call routing 234
- Routing configuration 235
- Call-by-Call services 236
- Call-by-Call service routing 238
- Using destination codes 239
- Why use destination codes? 240
- Deciding on a code 241
- Configuring Absorbed length 242
- Chapter 24 Dialing plans 243 243
- 244 Chapter 24 Dialing plans 244
- Chapter 24 Dialing plans 245 245
- 246 Chapter 24 Dialing plans 246
- Chapter 25 247
- Figure 74 Routing workflow 248
- Services: Routing Service) 250
- Create unique 254
- Specify dial-out digits 254
- Route through Pool A 254
- Specify which route to use 255
- Add Destination code to 255
- Create unique code 255
- Chapter 26 259
- Configuration > 261
- Destination codes 262
- Second Dial Tone 265
- Figure 84 Second Dial Tone 266
- Table 2 Second Dial Tone 266
- Chapter 27 267
- DN length constraints 270
- Received number notes 271
- Chapter 28 275
- Public Network Settings 276
- Public network DN lengths 277
- Modifying a DN prefix 278
- Carrier Codes 279
- Adding a carrier code 280
- Modifying a carrier code 280
- Deleting a carrier code 280
- Chapter 29 281
- Private Network Settings 282
- Chapter 30 289
- Public network: DID system 290
- Figure 93 DID system 291
- Chapter 31 293
- Callers using BCM 294
- Callers in the public network 294
- Chapter 32 297
- Software requirements 298
- Message Waiting Indication 299
- Programming notes 300
- Break-in 301
- MCDN networking checklist 303
- UDP-specific programming 304
- CDP-specific programming 305
- Meridian TRO programming 307
- WarehouseHead Office 312
- Networking with ETSI QSIG 313
- Chapter 33 315
- Remote access to the network 316
- Types of private networks 316
- Chapter 34 319
- Chapter 35 323
- Using VoIP to tandem systems 327
- To set up a network of BCMs 328
- Chapter 36 331
- Setting Diversion 332
- Using the Redirection feature 333
- Call offer 334
- Route Optimization 335
- Loop avoidance 335
- Private networking with DPNSS 335
- Chapter 37 339
- Chapter 38 343
- Chapter 39 347
- Chapter 40 351
- Meridian system as host 352
- System set up for host system 352
- To configure the host system 353
- Chapter 41 357
- Line pool access code notes: 358
- Line pools: DNs tab 359
- Table 42 360
- Chapter 42 363
- Telephones 364
- Gatekeepers 364
- SIP Proxy 364
- IP Network 364
- Key VoIP concepts 365
- 366 Chapter 42 VoIP overview 366
- Chapter 43 367
- Keycodes 368
- Local gateway programming 369
- Routing Table 370
- PSTN call to remote node 371
- Call process 372
- Describing a fallback network 374
- How fallback routing works 375
- Gatekeeper call scenarios 378
- Chapter 44 381
- Setting up the local gateway 383
- Setting up remote gateways 385
- Configuring VoIP lines 385
- Chapter 45 389
- CS 1000 configuration 390
- Chapter 46 391
- To add the VoIP route 392
- To assign VoIP line pool 393
- Example: 394
- Examples: 394
- To deactivate a schedule 396
- Chapter 47 401
- To enable a T.38 fax 402
- Media gateways 402
- T.38 Fax restrictions 403
- 404 Chapter 47 T.38 fax 404
- Chapter 48 405
- Chapter 49 407
- UDP Port Ranges 409
- Signaling Port Ranges 410
- Chapter 50 411
- Chapter 51 413
- Chapter 52 415
- Default filters (other) 418
- Restriction filter examples 418
- Remote call-in programming 419
- Remote access line settings 420
- Remote access on DPNSS lines 421
- Defining CoS passwords 423
- External access tones 425
- Chapter 53 427
- Remote access on PRI 431
- Other programming: 432
- Chapter 54 433
- To add a restriction filter 435
- Default filters 436
- Chapter 55 439
- Chapter 56 443
- Programming references: 444
- Notes about CoS passwords 445
- CoS examples 446
- Chapter 57 449
- 450 Chapter 57 LAN overview 450
- Chapter 58 451
- Chapter 59 453
- Chapter 60 455
- To modify an IP address 456
- DNS Settings options 456
- MTU option 456
- Internal Subnet settings 458
- To modify a subnet 459
- Internal Subnet Details 459
- Configuring static routes 463
- To add a new IP Static Route 463
- 464 Chapter 60 IP Subsystem 464
- Chapter 61 465
- Network devices 466
- Network assessment 466
- VoIP trunks 468
- IP telephone records 468
- Chapter 62 469
- Chapter 63 471
- 472 Chapter 63 Router panel 472
- Chapter 64 473
- 474 Chapter 64 VLAN overview 474
- Chapter 65 475
- DHCP network scenarios 476
- With external DHCP server 477
- Default configurations 478
- Chapter 65 DHCP overview 479 479
- 480 Chapter 65 DHCP overview 480
- Chapter 66 481
- VLAN options 483
- DHCP subnets 486
- To add a Reserved Address 488
- To delete a Reserved Address 488
- Main panel tabs: Lease Info 489
- Chapter 67 491
- DHCP for IP sets 492
- Disabling the DHCP server 493
- Chapter 68 495
- Chapter 69 497
- Remote Access Service 498
- Modem compatibility 500
- Chapter 70 501
- ISDN interfaces 502
- To add an ISDN interface 503
- To enable an ISDN interface 503
- To disable an ISDN interface 503
- To delete an ISDN interface 504
- ISDN Dial-out Link Parameters 506
- ISDN Dial-out IP Address 508
- Modem interface 508
- To add the modem interface 508
- To enable the modem interface 509
- To delete a modem interface 510
- Global Settings panel 512
- WAN failover 513
- ISDN Dial-In Parameters panel 518
- Create a dial-up interface 524
- Add the SNMP Trap destination 524
- Appendix A 525
- 526 Appendix A VPN overview 526
- Encryption 527
- Protocol 528
- Encryption method 528
- Appendix B 529
- Comfort noise 533
- Appendix C 535
- Analog versus ISDN 536
- Types of ISDN service 536
- ISDN layers 536
- ISDN bearer capability 537
- PRI services and features 538
- BRI services and features 538
- Service provider features 539
- Network name display 539
- 540 Appendix C ISDN overview 540
- Emergency 911 dialing 541
- 2-way DID 541
- Dialing plan and PRI 541
- ISDN hardware 542
- S Reference Point 543
- T Reference Points 543
- Clock source for ISDN 544
- ISDN BRI NT1 equipment 544
- ISDN standards compatibility 545
- Planning your ISDN network 545
- Ordering ISDN PRI 545
- Ordering ISDN BRI 546
- Supported ISDN protocols 547
- 548 Appendix C ISDN overview 548
- Appendix D 549
- RTP over IP (Sheet 2 of 2) 550
- Numerics 551
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