Cisco WS-X4604-GWY - VoIP Gateway Dokumentacja Strona 95

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CHAPTER
4-1
Cisco IP Telephony Network Design Guide
78-11103-03
4
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 candidatesranging from specialized, entry-level
standalone voice gateways to the high-end, feature-rich integrated router and
Catalyst gatewayscan 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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