02-02-2013, 12:42 PM
Voice Over Internet Protocol (VoIP) Issues and Challenges
Voice Over.ppt (Size: 1.98 MB / Downloads: 143)
Enters VoIP…What is it?
Many names, different meaning to different people:
Soft-switching
Next Generation Voice Network
IP Telephony
Voice over Internet
Voice over Internet Protocol
Voice over Packet
IP Communications
VoIP Realizations
PC Applications
PSTN Bypass
Toll
Enterprise
Broadband VoIP
Cable VoIP
Next Generation Network
Circuit-Switch Replacement
Service creation and customization
PC Applications – PC to PC (Internet to Internet)
User
Free calls between PCs
Low voice quality and reliability
Technology
PC client software (e.g. Microsoft NetMeeting) for voice and multimedia communications between PCs with the same client software
VoIP processing performed in PCs
Network
Network traffic carried in public Internet
No legacy PSTN
PSTN Bypass – PC to Phone
User
Voice calls between PC and PSTN phone
A fee normally charged
Voice quality varies, depending on service provider networks
Technology
PC client software
VoIP processing performed in PCs
Network
Network traffic carried in public Internet or in managed IP network
Requires VoIP Gateway to interwork with PSTN
Carrier PSTN Circuit Switch Replacement
Business Motivation
New competitive carriers: leap frog incumbent carrier by deploying new packet technology
Incumbent carriers: evolve legacy circuit-switched networks to packet-based to reduce cost and compete with new carriers
Provides IP Centrex features and service customizations as competitive solution to IP PBX
Provides Phone - Phone communication
Users can continue to use traditional voice phone set
IP phones are supported in IP Centrex
Stringent service and reliability requirements:
Voice quality at least equal to wireless phones
Five 9’s reliability
Policy and Regulation – Competitive Issues
Overall impact on competition is still impossible to predict
Would greater competition through VoIP lead to deregulation, or require greater regulation?
Will a major overhaul of competitive framework be required?
Should telephony services be regulated differently due to different technologies used?
TDM
VoIP as PSTN replacement
VoIP offered by ISPs
Cable Telephony
Access charges for VoIP service providers
Unbundling of access and network services:
Should competitive access be provided to choose VoIP service providers via Packer Cable or DSL access?