Panasonic KX-NS1000 Installation Manual page 331

Web applications) that use the same network. Therefore, care must be taken when assessing bandwidth
requirements.
Inform your network administrator of the required bandwidth, and make sure that the network can support VoIP
communications and signalling even under conditions of maximum network traffic.
Required Bandwidth per Call
The required bandwidth depends on the following factors:
•
The maximum number of simultaneous calls
•
Packet sending interval
•
Type of codec used
•
Telephone type
Keep in mind the following points about the types of codecs and packet sending intervals, in terms of speech
quality:
•
The speech quality of the codecs varies as follows: (High) G.722, G.711, G.729A (Low)
•
The shorter the packet sending interval, the higher the speech quality.
•
The higher the speech quality an IP telephone provides, the more bandwidth it requires.
*1 When the preferred codec of each party differs, the call will be established using the lower quality codec.
For example, if the caller prefers G.711 while the called party prefers G.729A, the call will be established using
G.729A.
Number of Simultaneous Calls
The number of simultaneous calls is proportional to number of extensions registered to the PBX, as shown in
the chart below. The proportion is approximately 0.25 when the number of registered extensions is 100. For
more information about the number of simultaneous calls, ask your local Panasonic dealer.
100
90
80
70
60
50
40
30
20
10
0
10 50
Number of Registered
Extensions
Number of Simultaneous
Calls
Required Bandwidth per Call for VoIP Communication
The required bandwidth for VoIP communication is determined by the codec used and the packet sending
interval.
100 150
Number of Registered Extensions
10 50 100
6 16 26
8.4.1 One-look Network
200 250
150 200 250
35 44 53
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300
300
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