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130 Quality of Service
P0937663 03.1
Business Communications Manager router QoS support
With a Business Communications Manager system, the VoIP gateway and the router are in the
same box. The Business Communications Manager router performs QoS and priority queuing to
support VoIP traffic. The router supports VoIP in the following two ways:
• In a DiffServ network, Business Communications Manager system acts as a DiffServ edge
device and performs packet classification, prioritization, and marking. The router performs
admission control for H.323 flows based on the WAN link bandwidth and utilization. When
received, the WAN link marks the H.323 flows as Premium traffic and places the flows in the
high priority queue.
• In a non-DiffServ or a legacy network, the router manages the WAN link to make sure
Premium VoIP packets have high priority in both directions when crossing a slow WAN link.
Network Quality of Service
Business Communications Manager VoIP Gateway uses a method like the ITU-T
Recommendation G.107, the E-Model, to determine the voice quality. This model evaluates the
end-to-end network transmission performance and outputs a scalar rating “R” for the network
transmission quality. The packet loss and latency of the end-to-end network determine “R”. The
model correlates the network objective measure “R”, with the subjective QoS metric for voice
quality, MOS or the Mean Opinion Score.
This model provides an effective traffic building process by activating the Fallback to
Circuit-Switched Voice Facilities feature at call set up to avoid quality of service degradation.
New calls fall back when the configured MOS values for all codecs are below the threshold.
The model is the reason for compression characteristics of the codecs. Each codec delivers a
different MOS for the same network quality.
Network monitoring
The VoIP Gateway network monitoring function measures the quality of service between the local
and all remote gateways on a continuous basis. The network monitoring function exchanges UDP
probe packets between all monitored gateways to collect the network statistics for each remote
location. All the packets make a round trip from the Sender to Receiver and back to the Sender.
From this information, you can calculate the latency and loss in the network for a distinct location.
Note 1: Quality of Service monitoring is supported only on Business Communications Manager,
M1 with ITG card, and i20xx.
Note 2: The Quality of Service threshold is configurable per remote gateway.
Note: Differentiated Service (DiffServ) is a QoS framework standardized by the Internet
Engineering Task Force (IETF).
- Business Communications 1
- Manager 2.5 1
- IP Telephony Configuration 1
- Trademarks 2
- Contents 3
- Chapter 4 4
- Chapter 5 5
- Chapter 6 6
- Appendix A 6
- 12 Tables 12
- Before you begin 13
- Symbols used in this guide 13
- Text conventions 14
- Acronyms 14
- Related publications 15
- How to get help 16
- Chapter 1 17
- Introduction 17
- IP telephones and VoIP trunks 18
- Figure 1 Network diagram 19
- Telephones 20
- IP network 21
- Key IP telephony concepts 22
- Jitter Buffer 23
- QoS routing 23
- Chapter 2 25
- Prerequisites checklist 25
- Network assessment 26
- Resource assessment 27
- Keycodes 27
- Defining published IP address 28
- IP telephones 30
- NetVision wireless telephones 30
- Chapter 3 31
- Installing IP telephones 31
- Choosing a codec 33
- Choosing a Jitter Buffer 34
- Before installing 34
- Using a 3-port switch 35
- NORTEL NETWORKS 36
- Manual Cfg DHCP(0 no, 1 yes) 36
- Field Value Description 37
- Slow connection 40
- One-way or no speech paths 40
- Dropped voice packets 40
- Changing the contrast level 40
- Configuring DHCP 41
- Figure 5 IP Terminal status 42
- Figure 6 Configuration menu 42
- Figure 8 Configuration menu 44
- Download Pending 44
- Customizing feature labels 46
- Moving IP telephones 47
- Keep DN alive 48
- Figure 12 i2050 Switch type 49
- 7 Click on the BCM option 50
- Configuring NetVision records 52
- /symbol.com> 53
- <http:/ 53
- Testing the handset functions 55
- Changing a handset Name 57
- Configuring VoIP trunks 59
- Configuring media parameters 60
- Setting silence compression 61
- Setting jitter buffers 62
- Outgoing call configuration 63
- Figure 18 Trunk/Line data 64
- Configuring a remote gateway 66
- Configuring PSTN fallback 68
- Enabling PSTN fallback 69
- Setting up the VoIP schedule 69
- Configuring routes 70
- Figure 26 VoIP schedule 73
- Activating the VoIP schedule 74
- Turning on QoS monitor 75
- Incoming call configuration 76
- Example configuration 78
- Making calls 82
- Connecting an i200X telephone 83
- Quality of Service Monitor 86
- Port settings 86
- Using firewalls 87
- Using a gatekeeper 88
- The call signaling method 89
- Gatekeeper call scenarios 91
- Typical applications 93
- Setting up the system 95
- Efficient Networking 99
- Network engineering 100
- LAN engineering examples 103
- WAN engineering 104
- Setting Non-linear processing 105
- (8 kb/s) 106
- P0937663 03.1 106
- Traceroute 106
- Enough link capacity 107
- Not enough link capacity 107
- Further network analysis 108
- Reduce link delay 109
- Reducing hop count 109
- Adjust the jitter buffer size 110
- Reduce packet errors 110
- Routing issues 111
- Appendix B 113
- Silence compression 113
- Comfort noise 116
- Appendix C 117
- Network performance utilities 117
- Appendix D 119
- Interoperability 119
- Speech path setup methods 120
- Media path redirection 120
- Gatekeeper 120
- Symbol NetVision telephones 121
- 122 Interoperability 122
- Appendix E 123
- Quality of Service 123
- Measuring Intranet QoS 124
- Recording routes 125
- Adjusting Ping measurements 126
- Measurement procedure 127
- 128 Quality of Service 128
- Traffic mix 129
- TCP traffic behavior 129
- Network Quality of Service 130
- Quality of Service parameters 131
- Fallback to PSTN 132
- Glossary 133
- 134 Glossary 134
- Glossary 135 135
- 136 Glossary 136
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