Alcatel OmniAccess 5510 ADSL Manual de usuario Pagina 19

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19 | Alcatel-Lucent Enterprise Forum 2009
All Rights Reserved © Alcatel-Lucent 2009
TDM voice and VoIP services will coexist.
Enterprises retain their traditional TDM voice
lines for a variety of reasons:
continued reliance on dependable PBX, key
systems
extended depreciation schedules for legacy
TDM equipment
general satisfaction with value derived from
current voice capabilities
Emergency 911 connectivity
Security
VoIP Deployments are gaining momentum:
Saving in long distance telephony
Voice-enabled instant messaging (IM) clients
(most noticeably MSN, Google, Yahoo, and
AOL) continue to prove useful to businesses
VoIP will not completely displace TDM wireline voice service in the foreseeable future.
Current Split Between TDM and IP Lines for All VoIP Users
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