Avaya IP Telephony Průvodce konfigurací

Part No. P0937663 03.1Business Communications Manager 2.5IP Telephony Configuration Guide

10 FiguresP0937663 03.1 Figure 41 Peak traffic, WAN link . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104Figure 42 C

100 Efficient NetworkingP0937663 03.1 Some WAN links can exist on top of layer 2 services such as Frame Relay and Asynchronous Transfer Mode (A

Efficient Networking 101IP Telephony Configuration Guide The peak bandwidth and average bandwidth requirements for a normal two-way call must t

102 Efficient NetworkingP0937663 03.1 With no silence suppression, both the transmit path and the receive path continuously transmit voice pack

Efficient Networking 103IP Telephony Configuration Guide With no silence suppression, both the transmit path and the receive path continuously

104 Efficient NetworkingP0937663 03.1 WAN engineeringWide Area Network (WAN) links are typically full-duplex links - both talk and listen traff

Efficient Networking 105IP Telephony Configuration Guide Additional feature configurationThis section contains additional information on config

106 Efficient NetworkingP0937663 03.1 Consider there are four IP telephony ports per site. Each site supports four VoIP ports. Assume the codex

Efficient Networking 107IP Telephony Configuration Guide Enough link capacityTable 15 sorts the computations so that for each link, the availab

108 Efficient NetworkingP0937663 03.1 Other intranet resource considerationsBottlenecks caused by non-WAN resources do not occur often. For a m

Efficient Networking 109IP Telephony Configuration Guide • Queuing delay: The queuing delay is the time it takes for a packet to wait in the tr

11IP Telephony Configuration Guide TablesTable 1 Network diagram prerequisites . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25Tab

110 Efficient NetworkingP0937663 03.1 Adjust the jitter buffer sizeThe parameters for the voice jitter buffer directly affect the end-to-end de

Efficient Networking 111IP Telephony Configuration Guide Routing issuesRouting problems cause unnecessary delay. Some routes are better than ot

112 Efficient NetworkingP0937663 03.1

113IP Telephony Configuration Guide Appendix BSilence compressionSilence compression reduces bandwidth requirements by as much as 50 per cent. This ap

114 Silence compressionP0937663 03.1 When silence compression is enabled, voice packets are only sent when a speaker is talking. In a typical v

Silence compression 115IP Telephony Configuration Guide Silence compression on Full Duplex LinksOn full duplex links, the transmit path and the

116 Silence compressionP0937663 03.1 When several calls are made over a full duplex link, all calls share the same transmit path and they share

117IP Telephony Configuration Guide Appendix CNetwork performance utilitiesThere are two common network utilities, Ping and Traceroute. These utilitie

118 Network performance utilitiesP0937663 03.1

119IP Telephony Configuration Guide Appendix DInteroperabilityBusiness Communications Manager 2.5 IP Telephony adheres to the ITU-T H.323v2 standards,

12 TablesP0937663 03.1

120 InteroperabilityP0937663 03.1 Speech path setup methodsBusiness Communications Manager 2.5 currently only initiates calls using H.323 slowS

Interoperability 121IP Telephony Configuration Guide Asymmetrical media channel negotiationBy default, the Business Communications Manager IP T

122 InteroperabilityP0937663 03.1

123IP Telephony Configuration Guide Appendix EQuality of ServiceThe users of corporate voice and data services expect these services to meet a level o

124 Quality of ServiceP0937663 03.1 The QoS level is aligned for user QoS metrics to provide an acceptable Mean Opinion Score (MOS) level. The

Quality of Service 125IP Telephony Configuration Guide Notice from the Ping output the difference of rtt. The repeated sampling of rtt allows y

126 Quality of ServiceP0937663 03.1 The Traceroute program checks if routing in the intranet is symmetric for each source destination pairs. Al

Quality of Service 127IP Telephony Configuration Guide Late packetsPackets that arrive outside of the window allowed by the jitter buffer are d

128 Quality of ServiceP0937663 03.1 Other measurement considerationsThe Ping statistics described above measure the intranet before IP telephon

Quality of Service 129IP Telephony Configuration Guide Traffic mixThis section describes QoS works with the IP telephony, and what new intranet

13IP Telephony Configuration Guide PrefaceThis guide describes IP Telephony functionality for the Business Communications Manager 2.5 and 2.5 plus Fea

130 Quality of ServiceP0937663 03.1 Business Communications Manager router QoS supportWith a Business Communications Manager system, the VoIP g

Quality of Service 131IP Telephony Configuration Guide Note 3: Fallback starts for all new originating calls if the QoS of any monitored gatewa

132 Quality of ServiceP0937663 03.1 Fallback to PSTNIf the measured Mean Opinion Score (MOS) for all codecs is below the configured threshold f

133IP Telephony Configuration Guide Glossaryaccess pointThis is a piece of hardware that has a hardwire connection to the internet and acts as a wirel

134 GlossaryP0937663 03.1 G.729A codec that provides near toll quality at a low delay. Uses compression to 8 kbit/s (8:1 compression rate). G.723.1

Glossary 135IP Telephony Configuration Guide published IP addressThe IP address that both the IP telephones and the Symbol NetVision telephones use

136 GlossaryP0937663 03.1

IP Telephony Configuration Guide137IndexNumbers3-port switchIP telephones 35relocating IP telephones 47Aabsorbed length 73access codeline pool

138 IndexP0937663 03.1computed load 126computer, IP telephoney prerequisites 30Conference Call 120configureDN record 38i2050 Software Phone

Index 139 IP Telephony Configuration Guideend to end delay 108, 124end to end DTMF signaling 119end-to-end packet loss, measuring 125errorsga

14 PrefaceP0937663 03.1 Text conventionsThis guide uses these following text conventions:AcronymsThis guide uses the following acronyms:Note: Note/

140 IndexP0937663 03.1Hunt group, target line to DN 76Ii2002connecting 83server parameters 37i2004connecting 83feature labels 46keep DN a

Index 141 IP Telephony Configuration Guiderouter IP 37server parameters 37Set IP, viewing 38settings 42slow connection 40staggered downlo

142 IndexP0937663 03.1Media path redirection 119media resources, prerequisite 27Meridian 1(also see M1)M1-ITG 59MCDN networking 93profile

Index 143 IP Telephony Configuration Guideusing a gatekeeper 88VoIP destination digits 67WAN engineering 104networksVLAN ports 30NEW SET

144 IndexP0937663 03.1remote gateway 66status display 86updating data 86qualitative scale, QoS 124Quality of Service Monitor (see QoS monit

Index 145 IP Telephony Configuration GuideSL-1MCDN fallback 94MCDN over VoIP 67slow connection 40slowStart 119Sniffer 117source gateway

146 IndexP0937663 03.1adding to DN records 65codecs 60configuration 59configuring incoming calls 76configuring NetMeeting clients 84conne

Preface 15IP Telephony Configuration Guide Related publicationsDocuments referenced in the Business Communications Manager 2.5 IP Telephony Configu

16 PrefaceP0937663 03.1 How to get help• USA and CanadaAuthorized Distributors - ITAS Technical Support Telephone: 1-800-4NORTEL (1-800-466-7835)If

17IP Telephony Configuration Guide Chapter 1IntroductionIP Telephony provides the flexibility, affordability, and expandability of the Internet to the

18 Chapter 1 IntroductionP0937663 03.1 IP telephones and VoIP trunksThis guide describes two similar applications for IP telephony on the Busine

Chapter 1 Introduction 19IP Telephony Configuration Guide Creating the IP telephony networkThis section explains the components of the Business

2 P0937663 03.1 Copyright © 2002 Nortel NetworksAll rights reserved. The information in this document is subject to change without notice. The

20 Chapter 1 IntroductionP0937663 03.1 Business Communications Manager 2.5The Business Communications Manager 2.5 is a key building block in cre

Chapter 1 Introduction 21IP Telephony Configuration Guide VoIP trunks and analog/digital telephonesWhile analog and digital telephones cannot be

22 Chapter 1 IntroductionP0937663 03.1 The Business Communications Manager 2.5 Programming Operations Guide has a data section that describes th

Chapter 1 Introduction 23IP Telephony Configuration Guide If you experience poor voice quality, and suspect it is due to heavy network traffic,

24 Chapter 1 IntroductionP0937663 03.1 The header contains the network address of the sending and receiving IP telephones, and a TOS (Type Of Se

25IP Telephony Configuration Guide Chapter 2Prerequisites checklistBefore you set up VoIP trunks or IP telephones on a Business Communications Manager

26 Chapter 2 Prerequisites checklistP0937663 03.1 Network assessmentTable 3 questions are meant to ensure that the network is capable of handlin

Chapter 2 Prerequisites checklist 27IP Telephony Configuration Guide Resource assessmentAnswer the questions in Table 4 to determine if you have

28 Chapter 2 Prerequisites checklistP0937663 03.1 Business Communications Manager system configurationSeveral sections of the Business Communica

Chapter 2 Prerequisites checklist 29IP Telephony Configuration Guide Determining the published IP addressUse the flowchart in Figure 3 to determ

3IP Telephony Configuration Guide ContentsPreface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

30 Chapter 2 Prerequisites checklistP0937663 03.1 IP telephonesComplete this section if you are installing IP telephones. Table 7 IP telephone

31IP Telephony Configuration Guide Chapter 3Installing IP telephonesAn IP telephone converts the voice signal into data packets and sends these packet

32 Chapter 3 Installing IP telephonesP0937663 03.1 Configuring Nortel Networks i-series telephonesThe configuration menus for the Nortel Network

Chapter 3 Installing IP telephones 33IP Telephony Configuration Guide 6 In the Advertisement/Logo box, type a string of text characters. This me

34 Chapter 3 Installing IP telephonesP0937663 03.1 Choosing a Jitter BufferA jitter buffer is used to prevent the jitter associated with arrivin

Chapter 3 Installing IP telephones 35IP Telephony Configuration Guide Using a 3-port switchIn an office environment where a LAN network already

36 Chapter 3 Installing IP telephonesP0937663 03.1 When the telephone registers, it downloads the information from the Business Communications M

Chapter 3 Installing IP telephones 37IP Telephony Configuration Guide Table 8 describes the value for each parameter and what they mean.Table 8

38 Chapter 3 Installing IP telephonesP0937663 03.1 When you have entered all the configuration information, the telephone attempts to connect to

Chapter 3 Installing IP telephones 39IP Telephony Configuration Guide If an IP telephone does not bootIf the telephone does not boot, use the fo

4 ContentsP0937663 03.1 IP telephones . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

40 Chapter 3 Installing IP telephonesP0937663 03.1 Telephone does not connect to systemIf an IP telephone does not display the text Connecting t

Chapter 3 Installing IP telephones 41IP Telephony Configuration Guide Configuring DHCPYou can use Distributed Host Control Protocol (DHCP) to au

42 Chapter 3 Installing IP telephonesP0937663 03.1 Modifying settings for Nortel IP telephonesSettings such as jitter buffers and codecs for the

Chapter 3 Installing IP telephones 43IP Telephony Configuration Guide 5 From the menu, select Modify Codec/Jitter Buffer. The IP Terminal Status

44 Chapter 3 Installing IP telephonesP0937663 03.1 Download firmware to a Nortel IP telephoneFirmware is the software stored in the telephone. W

Chapter 3 Installing IP telephones 45IP Telephony Configuration Guide Deregistering DNs for IP telephonesYou can deregister selected telephones

46 Chapter 3 Installing IP telephonesP0937663 03.1 Customizing feature labelsWhen your IP telephone acquires a DN record, the default settings a

Chapter 3 Installing IP telephones 47IP Telephony Configuration Guide 3 If you have an existing list, or you do not want to change any defaults,

48 Chapter 3 Installing IP telephonesP0937663 03.1 4 If the new location is on a different LAN or WAN from the old location, the subnet mask, de

Chapter 3 Installing IP telephones 49IP Telephony Configuration Guide Configuring the Nortel Networks i2050 Software PhoneThe Nortel Networks i2

Contents 5IP Telephony Configuration Guide Assigning H.323 Terminals records . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

50 Chapter 3 Installing IP telephonesP0937663 03.1 7 Click on the BCM option.8 Enable the Select Sound Devices tab for the USB headset.To furthe

51IP Telephony Configuration Guide Chapter 4Installing NetVision telephonesThis chapter describes how to configure the Symbol NetVision handsets to th

52 Chapter 4 Installing NetVision telephonesP0937663 03.1 Handset and call functionsSymbol supplies a handset user guide that describes the feat

Chapter 4 Installing NetVision telephones 53IP Telephony Configuration Guide Gathering system information before you startEnsure the following i

54 Chapter 4 Installing NetVision telephonesP0937663 03.1 Users Wizard. This wizard is explained in the Business Communications Manager 2.5 Prog

Chapter 4 Installing NetVision telephones 55IP Telephony Configuration Guide 3 In the Name field, type in the name of the user of the handset.4

56 Chapter 4 Installing NetVision telephonesP0937663 03.1 Updating the H.323 terminals recordIf you need to change the password for a NetVision

Chapter 4 Installing NetVision telephones 57IP Telephony Configuration Guide Changing a handset NameThe Name is the primary point of recognition

58 Chapter 4 Installing NetVision telephonesP0937663 03.1 4 Click Yes to delete the record.Under the Systems DNs heading, the DN record returns

59IP Telephony Configuration Guide Chapter 5Configuring VoIP trunksThis chapter explains how to configure voice over IP (VoIP) trunks on a Business Co

6 ContentsP0937663 03.1 Port settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

60 Chapter 5 Configuring VoIP trunksP0937663 03.1 Configuring media parametersThere are three steps to configuring media parameters:• Configurin

Chapter 5 Configuring VoIP trunks 61IP Telephony Configuration Guide Setting silence compressionThis section explains how to set silence compres

62 Chapter 5 Configuring VoIP trunksP0937663 03.1 Setting jitter buffersThis section explains how to select the jitter buffer size used on VoIP

Chapter 5 Configuring VoIP trunks 63IP Telephony Configuration Guide Outgoing call configurationThis section explains how to set up your system

64 Chapter 5 Configuring VoIP trunksP0937663 03.1 To put your lines into a line pool:1 In Unified Manager, click on the keys beside Services, Te

Chapter 5 Configuring VoIP trunks 65IP Telephony Configuration Guide 7 Click on the line pool that you selected as the VoIP line pool.The Pool s

66 Chapter 5 Configuring VoIP trunksP0937663 03.1 Configuring a remote gatewayThis section explains how to configure the Business Communications

Chapter 5 Configuring VoIP trunks 67IP Telephony Configuration Guide Figure 21 Remote gateway dialog3 In the Name field, type a name for the r

68 Chapter 5 Configuring VoIP trunksP0937663 03.1 If you intend on using fallback to a PSTN line, set the QoS monitor to enabled. Otherwise, set

Chapter 5 Configuring VoIP trunks 69IP Telephony Configuration Guide For PSTN fallback to work, you must ensure that the digits the user dials w

Contents 7IP Telephony Configuration Guide Adjust the jitter buffer size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

70 Chapter 5 Configuring VoIP trunksP0937663 03.1 2 Change the Service setting to Manual. 3 Change the Overflow setting to Y.Configuring routesC

Chapter 5 Configuring VoIP trunks 71IP Telephony Configuration Guide PSTN (to local PSTN lines):a Click the Add button. b In the Add routes dial

72 Chapter 5 Configuring VoIP trunksP0937663 03.1 Creating destination codes for fallbackCreate a destination code that includes the VoIP and PS

Chapter 5 Configuring VoIP trunks 73IP Telephony Configuration Guide 6 Click on the key beside Schedules, and highlight VoIP. The VoIP schedule

74 Chapter 5 Configuring VoIP trunksP0937663 03.1 In this case, the user dials the destination code plus the DN. The destination code is absorbe

Chapter 5 Configuring VoIP trunks 75IP Telephony Configuration Guide Turning on QoS monitorFor fallback to function, the QoS monitor must be ena

76 Chapter 5 Configuring VoIP trunksP0937663 03.1 Incoming call configurationTo receive an incoming call directly to the telephone from a VoIP n

Chapter 5 Configuring VoIP trunks 77IP Telephony Configuration Guide 4 Enter the number of an available target line (241-412). 5 Click the Save

78 Chapter 5 Configuring VoIP trunksP0937663 03.1 Example configurationThis section walks through a sample Business Communications Manager confi

Chapter 5 Configuring VoIP trunks 79IP Telephony Configuration Guide On Business Communications Manager OttawaThis procedure details actions tha

8 ContentsP0937663 03.1 Network Quality of Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130Netwo

80 Chapter 5 Configuring VoIP trunksP0937663 03.1 7 The installer sets up the VoIP schedule with these settings:• Service: Manual• Overflow: Y8

Chapter 5 Configuring VoIP trunks 81IP Telephony Configuration Guide 3 The installer configures the media for the system, using the following se

82 Chapter 5 Configuring VoIP trunksP0937663 03.1 11 The installer creates a destination code of 2.• Under the Normal schedule, the installer as

Chapter 5 Configuring VoIP trunks 83IP Telephony Configuration Guide Connecting an i200X telephoneThis section takes the example above and uses

84 Chapter 5 Configuring VoIP trunksP0937663 03.1 Remote access over VoIP trunksYou cannot program DISA or auto-answer for voice over IP (VoIP)

Chapter 5 Configuring VoIP trunks 85IP Telephony Configuration Guide 3 Click Advanced Settings.The advanced settings dialog appears.Figure 31

86 Chapter 5 Configuring VoIP trunksP0937663 03.1 Quality of Service MonitorThe Quality of Service Monitor is an application that monitors the q

Chapter 5 Configuring VoIP trunks 87IP Telephony Configuration Guide Using firewallsFirewalls can interfere with communications between the Busi

88 Chapter 5 Configuring VoIP trunksP0937663 03.1 4 Change the port settings.5 Click the Save button.Port settings for legacy networksBusiness C

Chapter 5 Configuring VoIP trunks 89IP Telephony Configuration Guide The call signaling methodThe call signaling method defines how the Business

9IP Telephony Configuration Guide FiguresFigure 1 Network diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

90 Chapter 5 Configuring VoIP trunksP0937663 03.1 Modifying the call signaling methodTo modify the call signaling method:1 In the Unified Manage

Chapter 5 Configuring VoIP trunks 91IP Telephony Configuration Guide Gatekeeper call scenariosThis section explains what must be set up, and how

92 Chapter 5 Configuring VoIP trunksP0937663 03.1 If call signaling is set to Gatekeeper Routed and no pre-granted ARQ has been issued:1 Busines

93IP Telephony Configuration Guide Chapter 6Typical applicationsThis section explains several common installation scenarios and provides examples abou

94 Chapter 6 Typical applicationsP0937663 03.1 Setting up MCDN over VoIP with fallbackTo set up this system:1 Make sure the M1 ITG meets the fol

Chapter 6 Typical applications 95IP Telephony Configuration Guide Networking multiple Business Communications ManagersThe system shown in Figure

96 Chapter 6 Typical applicationsP0937663 03.1 This system uses fallback to PSTN so calls can be routed across the PSTN connection if VoIP traff

Chapter 6 Typical applications 97IP Telephony Configuration Guide Setting up the call chain configurationTo set up this system:1 Ensure that the

98 Chapter 6 Typical applicationsP0937663 03.1 Setting up a remote-based IP telephoneTo set up this system:1 Ensure that each remote user has a

99IP Telephony Configuration Guide Appendix AEfficient NetworkingThis appendix provides information about making your network run more efficiently. De