IP-to-IP Gateway Overview

VoIP has gained acceptance with enterprise, service provider, and commercial customers, and the migration of voice traffic from public switched telephone network (PSTN) to voice traffic over the IP network is underway. Increasing numbers of customers, looking for richer services than the PSTN can provide, are starting to interconnect their VoIP networks. However, interconnecting disparate VoIP networks has a new set of challenges that need to be dealt with. These new network requirements include the following:

  • Creating proper points of demarcation between enterprises and service providers, primarily for providing security and collection of call detail records (CDRs) for voice quality statistics and billing.
  • Hiding internal network topology from the peering partner or the outside world for security purposes.
  • Providing interworking between H.323 and Session Initiation Protocol (SIP)
  • Addressing various other challenges, such as transcoding media, routing VoIP traffic to traverse firewalls and Network Address Translation (NAT), ensuring quality of service (QoS), and employing call admission control (CAC).

Cisco Multiservice IP to IP Gateway

Part I: Voice Gateways and Gatekeepers

Gateways and Gatekeepers

Part II: Gateways

Media Gateway Control Protocol


Session Initiation Protocol

Circuit Options

Connecting to the PSTN

Connecting to PBXs

Connecting to an IP WAN

Dial Plans

Digit Manipulation

Influencing Path Selection

Configuring Class of Restrictions

SRST and MGCP Gateway Fallback

DSP Resources

Using Tcl Scripts and VoiceXML

Part III: Gatekeepers

Deploying Gatekeepers

Gatekeeper Configuration

Part IV: IP-to-IP Gateways

Cisco Multiservice IP-to-IP Gateway

Appendix A. Answers to Chapter-Ending Review Questions


Cisco Voice Gateways and Gatekeepers
Cisco Voice Gateways and Gatekeepers
ISBN: 158705258X
EAN: 2147483647
Year: 2004
Pages: 218

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