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Interoperability 121
IP Telephony Configuration Guide
Asymmetrical media channel negotiation
By default, the Business Communications Manager IP Telephony gateway supports the G.729
codec family, G.723.1, G.711
µ
-law and G.711 A-law audio media encoding. Because NetMeeting
does not support the H.323 fastStart call setup method, NetMeeting can choose a different media
type for its receive and transmit channels. However, Business Communications Manager IP
Telephony gateway does not support calls with different media types for the receive and transmit
channels and immediately hangs up a call taken with asymmetric audio channels. In this case, the
party on the Business Communications Manager switch hears a treatment from the switch
(normally a reorder tone). The party on the NetMeeting client loses connection.
To solve this problem, in NetMeeting, under the Tools, Options, Audio, Advanced, check
Manually configure compression settings, and ensure that the media types are in the same order
as shown in the Business Communications Manager media parameters table. Table 19 lists the
names used by the Business Communications Manager local gateway table and the matching
names in NetMeeting.
No feedback busy station
The Business Communications Manager VoIP gateway provides call progress tones in-band to the
user. If a busy station is contacted through the gateway, the gateway plays a busy tone to the user.
However, as NetMeeting does not support fastStart, no speech path is opened to the user before the
call connects. Because of this, the user on the NetMeeting station does not hear a busy signal from
the gateway.
Symbol NetVision telephones
In order to make calls between Symbol telephones and Business Communications Manager 2.5,
each must be configured to have at least one common codec. The following codecs are supported
by the NetVision telephones.
• G.711 u-law
• G.711 A-law
• G.729 Annex A and Annex B
Table 19 Name comparison
Business Communications Manager media
parameters table MS NetMeeting
G.723.1 6.3 Kbit/s MS G.723 6400 bit/s
G.723.1 5.3 Kbit/s MS G.723 5333 bit/s
G.711
µ
-law CCITT
µ
-law
G.711 A-law CCITT A-law
- 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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