Cisco WS-X4604-GWY - VoIP Gateway Especificaciones descargar pdf (Pagina 95)

CHAPTER

4-1

Cisco IP Telephony Network Design Guide

78-11103-03

Gateway Selection

This chapter discusses issues concerning the selection of gateways for connecting

an IP telephony network to the PSTN or legacy PBX and key systems. Choosing

a gateway from some 20 candidates—ranging from specialized, entry-level

standalone voice gateways to the high-end, feature-rich integrated router and

Catalyst gateways—can be daunting.

Although your particular VoIP implementation dictates specific gateway

requirements, these are common required features:

• Dual tone multifrequency (DTMF) relay capabilities

• Ability to handle clustered Cisco CallManager systems

• Supplementary services support

Any gateway selected for an enterprise network should be able to support these

features. In addition, every implementation has its own site-specific feature

requirements, which helps you eliminate options.

This chapter includes these sections to address the required common and

site-specific features:

• Supported Protocols, page 4-2

• DTMF Relay, page 4-3

• Cisco CallManager Redundancy, page 4-5

• Supplementary Services, page 4-7

• Site-Specific Gateway Requirements, page 4-9

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Cisco WS-X4604-GWY - VoIP Gateway Especificaciones Pagina 95