Philips KX-TDA0490 manual 23

2.2 Programming

DSCP

			0		0		0		0		0		0		DSCP: 0
			0		0		0		0		0		1		DSCP: 1
		....			....	....			....		....		....
															DSCP: 62
			1		1		1		1		1		0
			1		1		1		1		1		1		DSCP: 63
Bit 8																	Reserved			Reserved	Bit 15
Bit 0																					Bit 32
IP Header	Version		IHL		Type of Service											Total Length
																						IP Packet
HEX		....									....							....
																			HEX: 0
				0		0		0		0		0		0		0		0
				0		0		0		0		0		0		0		1	HEX: 1
		....				....		....	....		....		....		....			....
																			HEX: FE
				1		1		1		1		1		1		1		0
				1		1		1		1		1		1		1		1	HEX: FF
Bit 8																					Bit 15
Bit 0																					Bit 32
IP Header	Version		IHL		Type of Service											Total Length
																						IP Packet
		....									....							....

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

Programming Guide 23