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P0911590 Issue 02 Enterprise Edge 2.0 IP Telephony Configuration Guide
Overview
The Enterprise Edge VoIP Gateway reduces communication costs by routing voice
traffic over private Internet Protocol (IP) networks as part of the Enterprise Edge
product portfolio. Enterprise Edge uses IP telephony to link multiple sites together
using an existing corporate data network. The IP trunks are an important part of the
telephony services. IP telephony is transparent to users.
IP telephony involves the conversion of voice from its normal telephony format
(continuous analog or digital signal) into a digital packet format transported over an
intranet.
IP telephony operates on an installed corporate IP network. IP telephony requires a
correctly managed intranet, instead of the internet. The private IP network facilities
must have sufficient bandwidth on the private Wide Area Network (WAN)
backbone. The Engineering guidelines chapter on page 15 contains information
about determining if your corporate IP network can support IP telephony. A
keycode controls the number of supported IP ports.
IP telephony uses a Web-based browser for configuration. See the Configuration
chapter on page 61 for information about how to configure IP telephony.
The VoIP Gateway supports ITU-H.323v2 gatekeeper operation. The VoIP
Gateway allows Enterprise Edge systems to use a central facility for IP address
resolution. The VoIP Gateway uses standard Digital Signal Processor (DSP) voice
coding. The VoIP Gateway supports compression algorithms (codecs) such as
G.711, G.723, and G.729. See Codec types on page 37 in the Engineering
guidelines chapter for information about codecs.
The VoIP Gateway monitors the data network and reroutes calls to the conventional
circuit-switched voice facilities if Quality of Service (QoS) over the data network
decreases. This Fallback to Conventional Circuit-Switched Voice Facilities feature
allows the system and installer to determine the acceptable QoS over the data
network. The customer can configure QoS parameters according to their
requirements. See the Quality of service parameters section on page 10 and
Configuration of fallback to conventional circuit-switched facilities section on
page 67 in the Configuration chapter for information about configuring the QoS
parameters. If the quality is below the expected level of QoS, the conventional
circuit-switched voice facilities route is selected until the QoS returns to an
acceptable level.
The VoIP Gateway also activates fallback for other cases when a call cannot be
completed. Examples include no response from the destination, the remote gateway
table is improperly configured, or if there are not enough DSP resources to support
the call.
- 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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