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Voice over IP Fundamentals

CHAPTER 14 PSTN and VoIP Interworking. Voice over IP Fundamentals. Cisco Packet Telephony: Connection Control Call Control Services. Cisco Packet Telephony: Connection Control Functionally sets up, maintains and tears down the call Uses AS5850, MGX 8850, 2600, 3600, and 3810

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Voice over IP Fundamentals

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  1. CHAPTER 14 • PSTN and VoIP Interworking Voice over IP Fundamentals

  2. Cisco Packet Telephony: • Connection Control • Call Control • Services

  3. Cisco Packet Telephony: • Connection Control • Functionally sets up, maintains and tears down the call • Uses AS5850, MGX 8850, 2600, 3600, and 3810 • Communicates with the Call Control Plane via Media Gateway Control Protocol (MGCP)

  4. Cisco Packet Telephony: • Call Control • Functionally signals, processes and route voice calls • Uses Signaling System Seven (SS7) • Processes include digit analysis and manipulation, route selection, hunting, and switch-based features • Interfaces with external logic programs • Uses or can use: MGCP, SIP, H.323, and MEGACO • Call Control plane is unknowing of the VoIP system and is there for transport • Can interact with IP, , ATM, Frame-relay….

  5. Cisco Packet Telephony: • Service Plane • Logic that provides enhanced services • Number translation • Account code authentication • Credit card validation • Virtual Private Network (VPN)

  6. Cisco Packet Telephony: • Packet Voice Network • Packet Voice Interexchange Carrier (IXC) tandem applications • Packet Voice Local Exchange Carrier (LEC) Class 4 relief applications • Endpoint client multimedia applications • Corporate voice on-net and off-net services • VoIP local/end office applications on cable infrastructure

  7. Cisco Packet Telephony: • Network Elements • Call Agent (PGW2200) • MG • Service Control Point • Service Node • Cable headend • Residential Gateway • H.323/SIP endpoint/client

  8. Cisco Packet Telephony: • Call Agent (PGW2200) • Cisco Media Gateway Controller (MGC) software, running on Sun Microsystems general computing platforms • Cisco Signaling Link Terminals (SLT) • LAN switch for IP interconnectivity of Cisco PGW2200 elements • (optional) H.323 Signaling Interface (HIS) adjunct processor • (optional) Management products, including the Cisco MGC Node Manager, Cisco Voice Services Provisioning Tool (VSPT), and Cisco Billing and Management Server (BAMS)

  9. Cisco Packet Telephony: • Call Agent (PGW2200) Gateway Applications • VoIP Transit • Primary Rate Interface (PRI) Grooming and TDM offload • SIP PSTN gateway • H.323 PSTN gateway

  10. Cisco Packet Telephony: • Call Agent (PGW2200) Core Capabilities • Call-Signal processing • Address resolution, call routing, resource management, connection control, and call detail record (CDR) generation • Service Access Functions • Management Interfaces

  11. Cisco Packet Telephony: • MG • Physical T1/E1 facility termination • Echo Cancelation • Balance of Jitter buffers • Voice Activity Detection (VAD) • Voice compression using, G.711, G.723, G.729 and others • Tone Generation • Dual-tone multifrequency (DTMF) transport • U-law and a-law transcoding • Quality of Service (QOS)

  12. Cisco Packet Telephony: • Service Control Point • Provides an execution environment for service logic • Transaction request (number translation) • 800 Toll free service • Local Number Policy

  13. Cisco Packet Telephony: • Cable Headend • Cable modem termination system • Data-over-cable Service Interface Specifications (DOCSIS)

  14. Cisco Packet Telephony: • Residential Gateway • Provides POTS ports to the home • Runs DOCSIS protocol • Example: DSL Modem

  15. Cisco Packet Telephony: • H.323/SIP • Wide range of voice/multimedia applications

  16. Cisco Packet Telephony: • Network Interfaces • Signaling Termination • Inter-call agent signaling • Connection control • Services Control

  17. Cisco Packet Telephony: • Signaling Termination • SS7 Links • Nonassociated signaling (A-links) • Fully associated signaling (F-links) • PRI Links • CAS Signaling • H.323

  18. Cisco Packet Telephony: • Inter-PGW2200 Signaling • Connection Control via MGCP • Services Control

  19. Cisco Packet Telephony: • PGW2200 Architecture • Application toolkit • Conversion Analyzer • Simulator

  20. Cisco Packet Telephony: • PGW2200 • Execution Environment • North American Numbering Plan • Route Analysis • Digit Analysis • Reroute on Congestion

  21. Cisco Packet Telephony: • PGW2200 Route Selection

  22. Cisco Packet Telephony: • PGW2200 Digit Analysis

  23. Cisco Packet Telephony: • PGW2200 Implementation

  24. Cisco Packet Telephony: • PGW2200 Implementation • Application Check-Pointing • MGC Node Manager • Accounting

  25. Cisco Packet Telephony: • PSTN Signaling Over IP • SCTP • IUA

  26. Cisco Packet Telephony: • Changing Landscape of PSTN-IP Interworking

  27. Cisco Packet Telephony: • Changing Landscape of PSTN-IP Interworking

  28. Cisco Packet Telephony: • Session Border Controller (SBC)

  29. End of Chapter 14

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