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112 Interoperability
P0937663 02.0
Speech Path Setup Methods
Business Communications Manager 2.5 currently only initiates calls using H.323 slowStart
methods. The Business Communications Manager will, however, accept and set up calls that have
been initiated by another endpoint using H.323v2 fastStart methods, as well as H.323 slowStart
methods.
Note that when using Symbol phones with Business Communications Manager 2.5, the Symbol
phones will have to be configured to use H.323 slowStart only due to interoperability issues with
fastStart between the Symbol telephones and the Business Communications Manager.
Media Path Redirection
Media path redirection occurs after a call has been established, when an attempt is made to
transfer to or conference in another phone. Business Communications Manager 2.5 does not
support codec re-negotiation upon media path redirection.
To ensure that call transfers, and conference works correctly, the following rules must be followed:
• The first preferred codec for VoIP Trunks must be the same on all Business Communications
Managers. (See “Configuring codecs” on page 54). If this codec is G.729, or G.723, the
Silence Suppression option must be the same on all Business Communications Managers
involved.
• If interworking with a Meridian 1-ITG , the profile on the Internet Telephony Gateway (ITG)
must be set to have the same first preferred codec as on the Business Communications
Manager, the Voice Activity Detection (VAD) option must be set to the same value as the
Silence Suppression on the Business Communications Manager and the ITG payload size
must be set to 30 ms.
• Symbol telephones must be configured to use the same codec as the preferred codec on
Business Communications Managers in the system.
If these rules are not adhered to, simple calls will still go through, but some transfer scenarios will
fail.
Table 16 Supported voice payload sizes
Codec Receive/transmit to M1-ITG Receive/transmit to others
G.711 Highest supported by both ends, up to 30
ms in 10 ms increments.
20 ms
G.723.1 30 ms 30 ms
G.729 Highest supported by both ends, up to 30
ms in 10 ms increments.
20 ms
- Business Communications 1
- Manager 2.5 1
- IP Telephony Configuration 1
- Trademarks 2
- Contents 3
- Chapter 4 4
- Chapter 5 5
- Appendix A 5
- Before you begin 13
- Symbols used in this guide 14
- Text conventions 14
- Acronyms 15
- UDP User Datagram Protocol 16
- WAN Wide Area Network 16
- Related publications 17
- How to get help 18
- Chapter 1 19
- Introduction 19
- The IP telephony network 20
- Chapter 1 Introduction 21 21
- Figure 1 Network diagram 21
- Telephones 22
- IP Network 22
- Key IP Telephony Concepts 23
- Jitter Buffer 24
- QoS routing 24
- Chapter 1 Introduction 25 25
- 26 Chapter 1 Introduction 26
- Chapter 2 27
- Prerequisites checklist 27
- Network assessment 28
- Resource Assessment 28
- Keycodes 29
- IP Telephones 30
- Chapter 3 31
- Installing IP Telephones 31
- Choosing a codec 33
- Choosing a Jitter Buffer 33
- Before Installing 34
- Manual Cfg DHCP(0 no, 1 yes) 35
- Configuring DHCP 38
- Figure 4 DHCP summary 39
- Figure 5 DHCP range 40
- Figure 6 IP Terminal status 41
- Figure 7 Configuration menu 42
- Figure 9 IP Terminal Status 43
- Download Pending 44
- Deregistering offline DNs 45
- Moving IP telephones 46
- H.323 devices 47
- 4 Click the Save button 49
- VoIP Trunk Configuration 51
- Configuring media parameters 53
- Configuring codecs 54
- Setting Silence Compression 54
- Setting Jitter Buffers 55
- Outgoing call configuration 56
- Figure 21 Trunk/Line data 57
- Figure 22 Line pool 58
- Configuring a remote gateway 59
- Configuring PSTN fallback 60
- Setting up a VoIP schedule 61
- Vo I P 62
- Configuring routes 63
- Figure 28 Route list 64
- Figure 29 Add route dialog 64
- Creating a destination code 65
- Figure 32 Normal schedule 66
- Configuring digits 67
- Activating the VoIP schedule 67
- Turning on QoS monitor 68
- Incoming call configuration 70
- Example configuration 71
- Making calls 74
- Connecting an i200X telephone 75
- Quality of Service Monitor 77
- Port settings 77
- Using firewalls 78
- Using a gatekeeper 80
- Gatekeeper call scenarios 82
- Typical applications 85
- MCDN functionality 86
- Networking 91
- Network Engineering 92
- Networking 93 93
- (64 kb/s) 93
- (5.3 kb/s) 93
- LAN Engineering Examples 95
- WAN engineering 96
- Setting Non-linear processing 96
- Networking 97 97
- Traceroute 97
- Enough link capacity 98
- Not enough link capacity 98
- Implementing the network 99
- Further network analysis 99
- Reduce link delay 100
- Reducing hop count 100
- Adjust the jitter buffer size 101
- Reduce packet errors 101
- Routing issues 102
- Silence compression 103
- Appendix B 103
- 104 Silence compression 104
- P0937663 02.0 104
- Silence compression 105 105
- 106 Silence compression 106
- Silence compression 107 107
- Comfort Noise 108
- Appendix C 109
- Network Performance Utilities 109
- Appendix D 111
- Interoperability 111
- Speech Path Setup Methods 112
- Media Path Redirection 112
- Gatekeeper 113
- Symbol Telephones 114
- Appendix E 115
- Quality of Service 115
- Measuring Intranet QoS 116
- Recording routes 117
- Adjustment for processing 118
- Late packets 118
- Quality of Service 119 119
- Traffic mix 120
- Network Quality of Service 121
- Packet loss 122
- Packet delay 122
- Delay variation (jitter) 123
- 124 Quality of Service 124
- Glossary 125
- 126 Glossary 126
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