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4-42 41-001343-02 REV04 – 05.2014
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 val-
ues 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 26, 46, and 46 respectively, this results in corresponding default
VLAN priorities of 3 for SIP, 5 for RTP, and 5 for RTCP (based on the settings in the table “DSCP Range/VLAN Priority Map-
ping” on page4-42).
You can change the default parameters by modifying just the DSCP values, just the VLAN priority values, or by modifying
all values.
LAN Port
vlan id VLAN ID
tos priority map SIP Priority
tos priority map RTP Priority
tos priority map RTCP Priority
PC Port
vlan id port 1 VLAN ID
QoS eth port 1 priority Priority
Notes:
• 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.
• Setting the LAN Port VLAN ID (vlan id) to 4095 and PC Port VLAN ID (vlan id port 1) to any ID from 1 to 4094 will allow
frames from the PC Port (containing a VLAN ID) to be untagged before being forwarded to the LAN Port and frames
from the LAN Port (without a VLAN ID) to be tagged with the configured VLAN ID before being forwarded to the PC
Port. For configuring this feature via the Phone UI and the Aastra Web UI, see “Configuring VLAN (optional)” on
page4-45. For configuring this feature using the configuration files, see Appendix A, the section, “Virtual Local Area
Network (VLAN) Settings” on page A-34.
• Alternatively setting the LAN Port VLAN ID (vlan id) to any ID from 1 to 4094 and PC Port VLAN ID (vlan id port 1) to
4095 will allow frames from the LAN Port (containing a VLAN ID) to be untagged before being forwarded to the PC
Port and frames from the PC Port (without a VLAN ID) to be tagged with the configured VLAN ID before being for-
warded to the LAN Port. For configuring this feature via the Phone UI and the Aastra Web UI, see “Configuring VLAN
(optional)” on page4-45. For configuring this feature using the configuration files, see Appendix A, the section, “Vir-
tual Local Area Network (VLAN) Settings” on page A-34.
Parameters in Configuration Files Parameters in Aastra Web UI