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communication then string "10" needs to be set.for this parameter.
Parameter name: VLAN_SW_P2VIDCR_REG
Type: string-integer
Default Value: 0
Notes: VLAN Switch VLAN ID/Priority setting register. If VLAN ID 20 is dedicated to
voice communication then string "20" needs to be set.for this parameter.
Parameter name: VLAN_SW_P3VIDCR_REG
Type: string-integer
Default Value: 0
Notes: VLAN Switch VLAN ID/Priority setting register. If VLAN ID 20 is dedicated to
voice communication then string "20" needs to be set.for this parameter
9.2 VLAN Configuration
9.2.1.1 Static Setting
The administrator can configure a voice VLAN ID and a data VLAN ID statically or the
VLAN can be configured to be dynamically (see section 9.2.1.2 VLAN Discovery below).
Parameter name: NETWORK_VLAN_ID
Type: Boolean
Default Value: 0
Notes: A VLAN ID of 0 traditionally means that traffic is untagged.
9.2.1.2 Dynamic Setting - VLAN Discovery
If the administrator configures that VLAN configuration to be dynamic, then the IP40 unit
will attempt to discover the correct VLAN automatically using a specific (configurable)
DHCP option set by LAN network engineer. Note that this means that the voice gateway
portion of the device needs to issue an untagged DHCP DISCOVER request, then if a
DHCP OFFER contains VLAN information, reconfigure the switch with the correct VLAN
IDs and issue a new DHCP DISCOVER tagged on the voice VLAN. Below is the
sequence for VLAN Discovery:
1. IP40 sends out DHCP Discover message to find out if there is a DHCP server
available.
2. If the DHCP Server sends a DHCP Offer back with the Option 43 Vendor Specific
Options in a special format, the IP40 will accept the Offer, send back the DHCP
Request, and save the VLAN ID provided by the DHCP Server
3. After DHCP Server sends the ACK message to the IP40, the IP40 will release the
IP address and start a new DHCP Discovery cycle using the now know Voice
VLAN
5/29/2009
Plantronics IP40 Administration Guide
Page 49
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