How Switch 5500-Ei Series Switches Identify Voice Traffic; Setting The Voice Traffic Transmission Precedence - 3Com 5500-EI PWR Install Manual

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tag to communicate with the voice gateway. In this case, the port connecting to the IP phone must

be configured to allow the packets tagged with the voice VLAN tag to pass.

An untagged packet carries no VLAN tag.

A tagged packet carries the tag of a VLAN.

To set an IP address and a voice VLAN for an IP phone manually, just make sure that the voice VLAN ID

to be set is consistent with that of the switch and the NCP is reachable to the IP address to be set.

How Switch 5500-EI Series Switches Identify Voice Traffic

Switch 5500-EI series Ethernet switches determine whether a received packet is a voice packet by

checking its source MAC address against an organizationally unique identifier (OUI) list. If a match is

found, the packet is considered as a voice packet. 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.

Switch 5500-EI series Ethernet switches support 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 Switch 5500-EI series switches.

Table 1-1 Default OUI addresses pre-defined on the switch

In order to improve the transmission quality of voice traffic, the switch by default re-marks the

precedence of the traffic in the voice VLAN as follows:

Set the CoS (802.1p) precedence to 6.

0003-6b00-0000

000f-e200-0000

00d0-1e00-0000

00e0-7500-0000

00e0-bb00-0000

Cisco phones

H3C Aolynk phones

Pingtel phones

Polycom phones

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5500-ei series