king 41 Phase X: Post Project Assessment Summary 43 Chapter 4 Cost Analysis Capital Costs Cost of Installation Cost of Equipment Border Element Chassis Cost Port Cost 48 Digital Signal Processor (DSP) Cost Software License Cost Monthly Recurring Costs Port/Line Charge Bandwidth Charge Service Level Agreement Charge Cost of Usage Pay as You Use Bundled Offer Burstable Shared Trunks Cost of Spike Calls Cost of Security Cost of Expertise/Knowledge Other Areas of Costs and Savings Summary 55 Further Reading SIP Trunking Part II: Planning Your Network for SIP Trunking Chapter 5 Components of SIP Trunks SP Network Components 57 SP Network-Edge Session Border Controllers SP Network-Call Agent 59 SP Network-Billing Server SP Network-IP Network Infrastructure SP Network-Customer Premise Equipment 64 SP Network-Media Gateways (Voice and Video) SP Network-Legally Required Supplementary Services Systems/Legal Intercept and Emergency Services SP Network-Enhanced Services 70 SP Network-Peering Session Border Controllers 71 SP Network-Monitoring Equipment 74 Enterprise Network Components Enterprise Networks-SP Interconnecting Session Border Controllers Enterprise Network: IP Network Infrastructure 77 Enterprise Network-Enterprise Session Management 77 Enterprise Networks-Application Interconnection Session Border Controller 78 Enterprise Networks-Intercompany Media Engine 79 Summary 79 Chapter 6 SIP Trunking Models Understanding the Traditional PSTN Gateway Connection Model Choosing a SIP Trunking Model 83 Types of Calls Carried by the SIP Trunk Single or Multiple Physical Entry Points International Call Access Physical Termination of Traffic into Your Network Centralized Model Distributed Model Hybrid Model Considering Trade-Offs with the Centralized and Distributed Models DID Number Portability 88 Regional or Geographic Boundaries Regulatory Considerations Containing Oversubscription 90 Quality of Service (QoS) Considerations Bandwidth Provisioning Latency Implications Operational and Equipment Implications Cost 92 High Avail