Aastra Telecom 55I, 57I CT, 53I manual Dscp Range/VLAN Priority Mapping, Vlan Priority

Configuring Network and Session Initiation Protocol (SIP) Features

Network Settings

DSCP Range/VLAN Priority Mapping

DSCP bits in the ToS field of the IP header are set for RTP, RTCP, and SIP packets using either the default values or the values configured via the "tos sip", "tos rtp", and "tos rtcp" parameters.

When the VLAN global configuration parameter, "tagging enabled" is set to 1, VLAN priority for IP packets is mapped to the DSCP value instead of a single priority for all packets. An administrator can also configure VLAN priority for non-IP packets using the "priority non-ip" parameter.

Since the default DSCP settings for SIP, RTP, and RTCP are 24, 32, and 32 respectively, this results in corresponding default VLAN priorities of 3 for SIP, 4 for RTP, and 4 for RTCP (based on the settings in the table “DSCP Range/VLAN Priority” on page 4-33).

You can change the default parameters by modifying just the DSCP values, just the VLAN priority values, or by modifying all values.

The following table shows the DSCP range/VLAN priority mapping.

DSCP Range/VLAN Priority

DSCP	VLAN Priority
Range
0-7	0
8-15	1
16-23	2
24-31	3
32-39	4
40-47	5
48-55	6
56-63	7

Configuring the IP Phones

41-001160-00, Release 2.1, Rev 04 4-33