CHAPTER 14 PSTN and VoIP Interworking

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  Communicates with the Call Control Plane via Media Gateway Control Protocol (MGCP)

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….

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

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

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

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)

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

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

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)

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

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

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

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

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

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

Cisco Packet Telephony: Inter-PGW2200 Signaling  Connection Control via MGCP  Services Control

Cisco Packet Telephony: PGW2200 Architecture  Application toolkit  Conversion Analyzer  Simulator

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

Cisco Packet Telephony: PGW2200 Route Selection

Cisco Packet Telephony: PGW2200 Digit Analysis

Cisco Packet Telephony: PGW2200 Implementation

Cisco Packet Telephony: PGW2200 Implementation  Application Check-Pointing  MGC Node Manager  Accounting

Cisco Packet Telephony: PSTN Signaling Over IP  SCTP  IUA

Cisco Packet Telephony: Changing Landscape of PSTN-IP Interworking

Cisco Packet Telephony: Changing Landscape of PSTN-IP Interworking

Cisco Packet Telephony: Session Border Controller (SBC)

End of Chapter 14