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Engineering guidelines 37
P0911590 Issue 02 Enterprise Edge 2.0 IP Telephony Configuration Guide
IP telephony settings
Codec types
The term codec refers to the voice coding and compression algorithm used by the
DSP on the telephony services and the MSPECs. See the Enterprise Edge
Programming Operations Guide for additional information on DSP and MSPEC
resources.
Determine the codec type for a VoIP Gateway call basis at call setup. The
originating gateway indicates to the remote gateway which codec types it supports,
starting with the selected order of use. The remote gateway, depending on its
capabilities, selects one of the codec types and continues with the call. If both ends
cannot agree on a codec type, the call fails.
All gateways in the intranet must use the same codec types.
Configure each gateway with available codecs with the selected order of use. The
codecs configuration must reflect available bandwidth on the network. Codec
options are between quality compared to bandwidth.
The supported codec types are configured in the Modifying the Local Gateway
Configuration table section on page 65. The G.711 codec provides the best audio
quality but uses the greatest amount of bandwidth. The G.729 and G.723.1 codecs
use less bandwidth, but reduce audio quality. The installer or administrator
determines the best option for the user and the available bandwidth on the intranet.
For example, if the WAN link cannot support multiple 64 kbit/s calls, G.711 must
not be configured as a supported codec.
Enterprise Edge IP Telephony supports and recommends the following order for
codec selection:
• G.729
• G.723.1 6.3 kbit/s or 5.3 kbit/s
• G.711
The G.729 codec provides the best balance of quality audio plus bandwidth savings.
G.729
The G.729 codec is the default and Preferred codec for IP telephony. The G.729
codec provides near toll quality with a low delay. This codec uses compression to
8 kbit/s. Enterprise Edge VoIP Gateway supports G.729 with silence compression,
per Annex B.
G.723.1
The G.723.1 codec uses the smallest amount of bandwidth. This codec uses the
greatest compression, 5.3 kbit/s or 6.3 kbit/s.
- Enterprise Edge 2.0 1
- IP Telephony 1
- Configuration Guide 1
- Contents 3
- 4 Contents 4
- Contents 5 5
- 6 Contents 6
- Overview 7
- About this document 8
- System Functions 8
- Dialing plan support 9
- Network Quality of Service 10
- Overview 11 11
- Network Performance Utilities 12
- Silence compression 13
- Echo cancellation 13
- Fax calls 14
- Alarm Notification 14
- Jitter buffer 14
- Engineering guidelines 15
- 16 Engineering guidelines 16
- Engineering guidelines 17 17
- Multiple network interfaces 18
- Method 1 19
- Method 2 19
- LAN engineering 20
- WAN engineering 22
- Link utilization 23
- 24 Engineering guidelines 24
- Setting QoS 26
- Measuring Intranet QoS 27
- Recording routes 28
- Adjusting ping measurements 29
- Measurement procedure 29
- Further network analysis 31
- Reduce link delay 32
- Reducing hop count 32
- Engineering guidelines 33 33
- Routing issues 34
- Traffic mix 35
- TCP traffic behavior 35
- Implementing the network 36
- IP telephony settings 37
- Engineering guidelines 39 39
- Figure 5 Silence compression 39
- Fallback threshold 42
- Dialing plan 43
- 44 Engineering guidelines 44
- Engineering guidelines 47 47
- 48 Engineering guidelines 48
- Figure 8 Toll bypass 48
- Setting 49
- 52 Engineering guidelines 52
- Intranet QoS monitoring 53
- User feedback 54
- Engineering checklist 55
- 56 Engineering checklist 56
- Installation 57
- Configuring a remote gateway 58
- Installation 59 59
- 60 Installation 60
- Configuration 61
- User Interface Overview 62
- Local Gateway Configuration 63
- Remote Gateway Configuration 65
- Configuration 67 67
- 68 Configuration 68
- Maintenance 69
- 70 Maintenance 70
- Interoperability 71
- No feedback busy station 72
- Glossary 73
- 76 Index 76
- Voice Jitter Buffer 76
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