3)After the IP phone acquires the IP address assigned by DHCP Server2, the IP phone establishes a connection to the NCP specified by DHCP Server1 and downloads corresponding software. After that, the IP phone can communicate properly.

z

z

An untagged packet carries no VLAN tag. A tagged packet carries the tag of a VLAN.

How the Device Identifies Voice Traffic

The device determines whether a received packet is a voice packet by checking its source MAC address. Packets with their source MAC addresses complying with the configured OUI (organizationally unique identifier) addresses are treated as voice packets. Ports receiving packets of this type will be added to the voice VLAN automatically for transmitting voice data.

You can configure OUI addresses for voice packets or specify to use the default OUI addresses.

An OUI address is a globally unique identifier assigned to a vendor by IEEE. You can determine which vendor a device belongs to according to the OUI address which forms the first 24 bits of a MAC address. The WX3000 supports OUI address mask configuration. You can adjust the matching depth of MAC address by setting different OUI address masks.

The following table lists the five default OUI addresses on the device.

Table 1-1Default OUI addresses preset on the device

Number

OUI address

Vendor

1

0003-6b00-0000

Cisco phones

 

 

 

2

000f-e200-0000

H3C Aolynk phones

 

 

 

3

00d0-1e00-0000

Pingtel phones

 

 

 

4

00e0-7500-0000

Polycom phones

 

 

 

5

00e0-bb00-0000

3Com phones

 

 

 

Configuring Operation Mode for Voice VLAN

A voice VLAN can operate in two modes: automatic and manual. You can configure the operation mode for the voice VLAN according to data traffic passing through a port.

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3Com WX3000 How the Device Identifies Voice Traffic, Configuring Operation Mode for Voice Vlan, Number OUI address Vendor
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