Avaya 9600 Series - Chapter 18: Voicemail; Message Waiting Indication

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absolute authority. Otherwise, you can set VLAN tagging manually, by DHCP, or in the

46xxsettings.txt file.

If VLAN tagging is enabled (L2Q=0 or 1), the 9600 Series IP Deskphones set the VLAN ID to

L2QVLAN, and VLAN priority for packets from the deskphone to L2QAUD for audio packets and

L2QSIG for signaling packets. The default value (6) for these parameters is the recommended

value for voice traffic in IEEE 802.1D.

Regardless of the tagging setting, a 9600 Series IP Deskphone will always transmit packets from

the deskphone at absolute priority over packets from the secondary Ethernet interface from an

attached PC. The priority settings are useful only if the downstream equipment is administered to

give the voice VLAN priority.

Related links

Administering a VLAN on page 102

The VLAN default value and priority tagging

The parameter L2QVLAN identifies the 802.1Q VLAN Identifier and is initially set to 0. This default

value indicates priority tagging and specifies that your network Ethernet switch automatically insert

the default VLAN ID without changing the user priority of the frame.

But some switches do not process a VLAN ID of zero and require frames tagged with a non-zero

VLAN ID.

If you do not want the default VLAN to be used for voice traffic, set the value of L2QVLAN to the

VLAN ID appropriate for your voice LAN.

You can also administer another parameter VLANTEST that defines the number of seconds the

9600 Series IP Deskphone waits for a DHCPOFFER message when using a non-zero VLAN ID.

The VLANTEST default is 60 seconds. If you use VLANTEST, the deskphone returns to the

default VLAN if an invalid VLAN ID is administered or if the phone moves to a port where the

L2QVLAN value is invalid.

The default value of VLANTEST is long, allowing for the scenario that a major power interruption

is causing the phones to restart. Always allow time for network routers, the DHCP servers, and

other equipment to be returned to service. If the deskphone restarts for any reason and the

VLANTEST time limit expires, the administered VLAN ID becomes invalid. The deskphone then

initiates operation with a VLAN ID of 0. Or, if the value of L2Q is 0, that is auto, the deskphone

turns off tagging until the L2QVLAN is set to a non-zero value or until the deskphone verifies that

the network can support tagged frames.

Setting VLANTEST to “0” causes the phone to use a non-zero VLAN indefinitely to attempt DHCP.

In other words, the deskphone does not return to the default VLAN.

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