csg mini-workshop voice over ip
DESCRIPTION
CSG mini-Workshop Voice over IP. Jim Jokl – Virginia Susan DeLellis – Harvard May, 2001. VoIP Systems: Lots of definitions. PBX VoIP line or trunk card - A Call path between IP phones via PBX Initial releases by Lucent, NEC, others PBX VoIP line or trunk cards - B - PowerPoint PPT PresentationTRANSCRIPT
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CSG mini-WorkshopVoice over IP
Jim Jokl – Virginia
Susan DeLellis – Harvard
May, 2001
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VoIP Systems: Lots of definitions
PBX VoIP line or trunk card - A Call path between IP phones via PBX Initial releases by Lucent, NEC, others
PBX VoIP line or trunk cards - B Call path between IP phones via LAN Nortel, Siemens, others have systems Most PBX manufacturers working towards this type
of functionality
Major advantage: phone features
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More VoIP System Definitions
LAN-based Systems Call setup via LAN call processing server Call path between all peripherals via LAN Cisco Call Manager Siemens HiPath Xpress Nortel Business Communications Manager Others
LAN-based systems generally limited ACD, console, call center applications
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Packet Voice: What is different?
Traditional Phone Switch Voice over IP (VoIP)
Phone Switch
Phone
Phone
PhonePhone Phone
Phone
PSTN
Campus Network
Routers, hubs, switches
PSTN
Gateway
Call Manager
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Network Capacity for Multimedia Applications
05
10152025303540
Percent
Method
Percent of Standard Ethernet
VoIPNetMeetingMPEG-4VCONWMMPEG2 (a)MPEG2 (b)
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Network Capacity for Packet Voice Services
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
G.711 G.726 G.728 G.729 G.723.1 G.723.1
Voice Codec Type
% o
f E
the
rne
t R
eq
uir
ed
0
10
20
30
40
50
60
70
80
90
100
Su
bje
cti
ve
Vo
ice
Qu
ali
ty
(%) % Ethernet
% Quality
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Network Infrastructure for Voice over IP Support
Low latency Low loss Predictable packet arrival High availability
Minimal capacity
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Network Quality of Service (QoS)
Goal: provide better service for some
Build lots of network capacity Layer 3 QoS Layer 2 QoS
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QoS: Useful for?
Have we seen the light?
Solving capacity problems? Protect voice traffic?
Need a way to remap QoS parameters where traffic enters the network
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Personal Computer
IP Phone
IP Phones and QoS
IP phone generates 802.1p CoS = 5 and IP precedence = 5
Switch in phone can clear PC’s QoS header settings
Phone and PC can be in different VLANs
Switched Network
Wall Jack
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IP Telephones and Power
Powering options Via Ethernet cable Via wall power transformer
Phone power consumption Tested Cisco and Nortel phones Between 4 and 6.5 watts/phone
Large wiring closet 250 phones, 75% efficiency
Closet power: 400 Watts Powering phones – no worse than 72 switch ports
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My Other Wireless Phone
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Wireless Data VoIP
Symbol NetVision Phone H.323 on 802.11 But no DSSS yet (summer)
Spectralink NetLink Phone System VoIP-based Both FHSS and DSSS available Proprietary adapter integration
Killer App: 802.11b/PCS dual mode phone?
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Wireless & QoS
Challenge: protect voice traffic Wireless LANs low bandwidth Easy to overload
SpectraLink Voice Priority (SVP) Retransmission modification Priority queuing in base station
Symbol Similar capabilities
Standards?
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Preparations at VirginiaThe Network
New backbone this summer Layer 3 switching IP Precedence
Wiring Closet 802.1p/Q New edge switches will reclassify traffic
Policy management, multicast Closet UPS and cooling work
Are these VoIP costs?
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VoIP at Virginia
Initial application: toll bypass AS-5300 Gateway – T1 to PBX 2600/3600/3810 at remote location Analog interface to remote PBX
Added Cisco Call Manager Couple dozen phones Voice mail issues Number portability
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VoIP at Virginia
Siemens HiPath 5500 One dozen phones PRI connection to Hicom PBX CorNet features
Nortel Business Communications Manager Planned for summer
Symbol?
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Next Steps
Continue to prepare network for converged applications
Select a VoIP system for larger pilots Harvest some low hanging fruit
Safe areas Telecommuters Wireless?
Solve the wired/wireless VoIP question Continue to watch technology
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Issues: Financial Model
Converged networks, especially VoIP, break most existing funding models
What to bill for Wall outlet? MAC Address? IP phone or soft phone? A tax based on headcount or NASF?
Central funding?