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Engineering guidelines 21
P0911590 Issue 02 Enterprise Edge 2.0 IP Telephony Configuration Guide
For more information about silence compression and fax calls, see the Silence
compression on page 38 and the Fax calls section on page 41.
Table 2 LAN and WAN IP bandwidth usage per Enterprise Edge Gateway (loaded to 36 CCS
per port per hour) without silence compression
Example 1: LAN engineering voice calls
Consider a site with four Enterprise Edge IP telephony ports. The Preferred codec
is G.729, using a voice payload of 20 ms. Silence compression is enabled.
Given the above, what is the peak traffic in kbit/s that IP telephony will put on the
LAN?
With Table 1 LAN and WAN IP bandwidth usage per Enterprise Edge Gateway
(loaded to 36 CCS per port per hour) with silence compression on page 20, for calls
with silence compression, each port generates 34.4 kbit/s when engaged in a call to
another gateway. If all four ports are in use, then the additional load is 137.6 kbit/s.
Example 2: LAN engineering fax calls
Consider a site with four IP telephony ports. The required codec is G.711, with a
voice payload of 20 ms. Silence compression is not used.
Codec Type Packet
duration
in ms
(payload)
Voice/fax
payload
in bytes
IP packet
in bytes
4
Ethernet
frame
bytes
4
Bandwidth
usage
on LAN
in kbit/s
Bandwidth
usage on
WAN
in kbit/s
G.711
6
(64 kbit/s)
10 80 240 292 233.6 96
7
20 160 400 452 180.8 80
30 240 560 612 163.2 74.6
7
G.729
6
(8 kbit/s)
10 10 100 152 121.6 40.0
7
20 20 120 172 68.8 24.0
30 30 140 192 51.2 18.6
7
G.723.1 (5.3
kbit/s)
30 20 120 172 45.8 16.0
G723.1
(6.3 kbit/s)
30 24 128 180 48.0 17.0
Note 1:
LAN data rate is the effective Ethernet bandwidth use.
Note 2:
LAN kbit/s = Ethernet frame bytes*8*1000/Frame duration in ms
Note 3:
50% voice traffic reduction due to silence compression; no compression for fax.
Note 4:
Overhead of (RTP+UDP+IP) packet over voice packet is 40 bytes; overhead of
Ethernet frame over IP packet is 26 bytes.
Note 5:
Keep Ethernet bandwidth to support to support an Interframe gap of at least 12
bytes per frame. This gap is not included in the above bandwidth calculation.
Note 6:
IP telephony uses a frame duration of 20 ms for G.729 and G.711.
Note 7:
If interworking with an M1-ITG, other frame durations are supported (config-
ured on the M1-ITG).
- 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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