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2.2 Programming
Programming Guide 23
DSCP
HEX
CODEC Frame Settings
The amount of required bandwidth depends on the type of CODEC and the selected packet sending
interval. The tables below show the amount of bandwidth required for one VoIP channel in each case:
Required Bandwidth for Voice Communication via LAN
CODEC
Packet Sending Interval
20 ms 30 ms 40 ms 60 ms 90 ms
G.711 87.2 kbps 79.5 kbps 75.6 kbps 71.7 kbps —
G.729A 31.2 kbps 23.5 kbps 19.6 kbps 15.7 kbps —
G.723.1 5.3 kbps — 20.8 kbps — 13.1 kbps 10.5 kbps
G.723.1 6.3 kbps — 21.9 kbps — 14.1 kbps 11.6 kbps
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Bit 0
Bit 8
IP Header Version IHL Total Length
Bit 15
ReservedReserved
Bit 32
IP Packet
Type of Service
DSCP: 0
DSCP: 1
DSCP: 62
DSCP: 63
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
....
....
....
....
....
....
....
....
....
Bit 0
Bit 8
IP Header Version IHL Total Length
Bit 15
Bit 32
IP Packet
Type of Service
HEX: 0
HEX: 1
HEX: FE
HEX: FF
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
....
....
....
....
....
....
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