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Advanced Network Settings
4-24 41-001129-00 Rev 09, Release 1.4.1
IP Phone Administrator Guide
Configuring the IP Phones
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 4-25).
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 piority mapping.
Notes:
1. In order for the software to successfully maintain connectivity with a
network using VLAN functionality, the IP phone reboots if you modify
the "tagging enabled" (VLAN enable in the Web UI), "VLAN id", or
"VLAN id port 1" parameters.
2. The "QoS eth port 0 priority" and "QoS eth port smp priority"
parameters were applicable to software release 1.3.1 and earlier. They
have no affect in software Release 1.4 and up.
3. When the Port 0 "VLAN id" and the Port 1 "VLAN id port 1"
parameters have the same value, VLAN functionality is compatible with
earlier IP phone software releases.