SIP Trunking

Cover......Page 1
Contents......Page 9
Introduction......Page 20
  History of IP Telephony......Page 24
  Basic Components of IP Telephony......Page 25
  Comparing VoIP Signaling Protocols......Page 27
  Call Control Elements of IP Telephony......Page 28
  Summary......Page 33
 Chapter 2 Trends in IP Telephony......Page 34
  Major Trends in IP Communications......Page 35
  Enterprise IP Communications Endpoints......Page 36
  Endpoint Trends in Enterprises and Their Effects on SIP Trunk......Page 42
  Feature Trends in SIP Trunking Within the Enterprise......Page 43
  Feature Trends in SIP Trunking Between Enterprises......Page 45
  Feature Trends in SIP Trunk for PSTN Access......Page 47
  Feature Trends in Advanced SIP Trunking Features from Service Providers......Page 49
  Feature Trends for Call Centers Services from SIP Trunk Providers......Page 51
  Summary......Page 53
 Chapter 3 Transitioning to SIP Trunks......Page 54
  Phase I: Assess the Current State of Trunking......Page 56
  Phase II: Determining the Priority of the Project......Page 57
  Phase IV: Conducting a Pilot Implementation of SIP Trunks for PSTN Access......Page 58
  Phase V: Transitioning a Live Department to SIP Trunks......Page 60
  Phase VI: Transition to SIP Trunking for Call Center Locations......Page 61
  Phase VII: Transition to SIP Trunking at Headquarters Locations......Page 62
  Phase VIII: Transition to SIP Trunking of Branch Locations......Page 63
  Phase X: Post Project Assessment......Page 64
  Summary......Page 66
 Chapter 4 Cost Analysis......Page 68
  Capital Costs......Page 69
  Monthly Recurring Costs......Page 72
  Cost of Usage......Page 74
  Cost of Security......Page 76
  Other Areas of Costs and Savings......Page 77
  Further Reading......Page 78
  SP Network Components......Page 80
  Enterprise Network Components......Page 98
 Chapter 6 SIP Trunking Models......Page 104
  Understanding the Traditional PSTN Gateway Connection Model......Page 105
  Choosing a SIP Trunking Model......Page 106
  Centralized Model......Page 107
  Distributed Model......Page 108
  Hybrid Model......Page 109
  Considering Trade-Offs with the Centralized and Distributed Models......Page 111
  Understanding the Centralized Model with Direct Media Model......Page 119
  Summary......Page 120
 Chapter 7 Design and Implementation Considerations......Page 124
  IP Connectivity Options......Page 125
  Dial Plans and Call Routing......Page 127
  Supplementary Services......Page 129
  Network Demarcation......Page 131
  Security Considerations......Page 135
  Session Management, Call Traffic Capacity, Bandwidth Control, and QoS......Page 147
  Scalability and High Availability......Page 153
  SIP Trunk Monitoring......Page 161
  Further Reading......Page 162
 Chapter 8 Interworking......Page 164
  Protocols......Page 165
  Media......Page 171
  Encryption Interworking......Page 179
  Further Reading......Page 181
  Technical Requirements......Page 184
  Delivery, Documentation, and Support......Page 203
  Quality......Page 206
  Business......Page 208
  Cost......Page 211
  Further Reading......Page 212
  Enterprise SIP Trunk for PSTN Access......Page 214
  SMB SIP Trunk for PSTN Access......Page 235
  Additional Deployment Variations......Page 246
  Troubleshooting......Page 263
  Further Reading......Page 264
 Chapter 11 Deployment Steps and Best Practices......Page 266
  Deployment Steps......Page 267
  Best Practices......Page 279
  Summary......Page 285
  Enterprise Connecting to a Service Provider......Page 286
  Distributed SIP Trunking to Connect PSTN......Page 297
  Summary......Page 318
 Chapter 13 Future of Unified Communications......Page 320
  Components of UC......Page 321
  UC Today......Page 322
  UC Is Anytime, Anyplace, Anywhere......Page 323
  Mobility Provides Access Anytime......Page 324
  Telepresence: the Future of Presence......Page 325
  UC in Healthcare......Page 326
  Journey Ahead......Page 327
  Summary......Page 331
 B......Page 334
 C......Page 335
 D......Page 336
 E......Page 338
 H......Page 339
 J K L......Page 340
 O......Page 341
 P......Page 342
 S......Page 343
 T......Page 345
 U......Page 346
 W X Y Z......Page 347