Features Page 237 of 910
IP Line Description, Installation and Maintenance
Configure the “p” bits
By default, the 3-bit field “p” bits are set to 110b (6), which is the value
recommended by Nortel. The “p” bit value can be changed using either OTM
or Element Manager. Two fields in OTM 2.2 and Element Manager are used
to set the “p” bits:
1A check box that, when selected, means the priority bits should be set to
the value specified by the 802.1Q priority bit value field. If the check box
is unselected, the IP Phone sends out the default priority of 6.
2A 802.1Q priority bit value field. This field sets the value that the IP
Phones sends out. The range is 0 – 7.
Configure the VOICE and DATA VLAN ID
The VOICE VLAN ID and DATA VLAN ID fields can be specified on a “per
interface” basis and are global settings. This means that all voice packets
transmitted by the IP Phone have the same VOICE VLAN ID and all data
packets have the same DATA VLAN ID. Though there is only one network
interface on the IP Phone, the IP Phone has two internal IDs: one for voice
traffic and one for data traffic. The IP Phone firmware can detect and route
the voice and data traffic.
Note: If a DATA VLAN is enabled, the IP Phone adds the DATA
VLAN ID to untagged traffic. However, if the traffic arriving on the PC
port is already tagged, the frame passes through unchanged.
The VLAN ID is specified as follows:
• The default VLAN ID is 000 (hex).
• The VOICE and DATA VLAN ID can be specified during a manual
configuration of the IP Phone using the IP Phone keypad, or
automatically retrieved using DHCP (automatic VLAN discovery).
• In the case of the VOICE VLAN ID, the VOICE VLAN ID can also be
configured by the DHCP parameter when using the Automatic VLAN ID
configuration using DHCP approach.
Note: For more information about manual or automatic IP Phone
configuration, refer to IP Phones: Description, Installation, and
Operation (553-3001-368).