User's Manual

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.
Automatic detection of a VLAN
The phones support automatic detection of the L2QVLAN setting that is incorrect. When the
value of L2QVLAN is not 0 and VLAN tagging is enabled, L2Q= 0 or 1, initially the B189
Conference IP Phone transmits DHCP messages with IEEE 802.1Q tagging and sets the VLAN
ID to L2QVLAN. The phones will continue to do this for number of seconds configured by
VLANTEST.
• If L2Q=1 and the VLANTEST timer expires because the phone has not received a
DHCPOFFER, the phone sets L2QVLAN=0 and transmits DHCP messages with the
default VLAN (0).
• If L2Q=0 and the VLANTEST timer expires because the phone has not received a
DHCPOFFER, the phone sets L2QVLAN=0 and transmits DHCP messages without
tagging.
• If VLANTEST is 0, the timer never expires.
Note:
Regardless of the setting of L2Q, VLANTEST, or L2QVLAN, you must have administer
DHCP on the phone so that the phone receives a response to a DHCPDISCOVER on
making that request on the default (0) VLAN.
After VLANTEST expires, if the phone receives a non-zero L2QVLAN value, the phone
releases the IP address and sends DHCPDISCOVER on that VLAN. Any other release
requires you to perform a manual reset before the phone attempts to use a VLAN on
which VLANTEST has expired.
The phone ignores any VLAN ID administered on the call server if a non-zero VLAN ID
is administered either by LLDP, manually, through DHCP, or through the settings file.
About DNS addressing
Avaya B189 Conference IP Phones support DNS addresses, dotted decimal addresses, and
colon-hex addresses. The phone attempts to resolve a non-ASCII-encoded dotted decimal IP
address by checking the contents of DHCP Option 6. For more information, see
DHCP Generic
Setup on page 42. At least one address in Option 6 must be a valid, non-zero, dotted decimal
address. Otherwise DNS fails. The text string for the DOMAIN system parameter, Option 15
Administering Deskphone Options
64 Administering Avaya B189 Conference IP Phone December 2013
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