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-SIPGW16 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
296 Installation Manual Document Version 2016-03
8.4.4 Bandwidth Requirements
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