• 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