Note that the amount in the table is only a guide. Subscribe to a network that has enough bandwidth. If the
amount of bandwidth required for VoIP communications is larger than what the network can accommodate,
speech quality will be compromised.
Required Bandwidth for Each Channel
The required bandwidth depends on what combination of codecs and packet sending interval is used. Keep
in mind the following points about the type of codec and packet sending interval, in terms of the speech quality:
•
The speech quality of the codecs varies as follows: G.711 (High), G.729A (Low)
•
The shorter the packet sending interval, the higher the speech quality.
•
The higher the speech quality the V-SIPGW4 card provides, the more bandwidth the WAN requires.
Codec
Packet Sending Interval
10 ms
20 ms
30 ms
40 ms
50 ms
60 ms
G.711
110.4 kbps
87.2 kbps
79.5 kbps
75.6 kbps
73.3 kbps
71.7 kbps
G.729A
54.4 kbps
31.2 kbps
23.5 kbps
19.6 kbps
17.3 kbps
15.7 kbps
288
Installation Manual
8.3.4 Bandwidth Requirements
Summary of Contents for KX-NS300
Page 92: ...4 Hook the main unit on the screw heads 92 Installation Manual 4 2 10 Wall Mounting...
Page 150: ...150 Installation Manual 4 13 Starting the KX NS300...
Page 248: ...248 Installation Manual 5 11 Automatic Configuration of Mailboxes...
Page 252: ...252 Installation Manual 6 1 Methods of Stacking Expansion Units...
Page 294: ...294 Installation Manual 8 5 Port Security...
Page 298: ...298 Installation Manual 9 2 System Prompt Languages...
Page 299: ......