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Administering Telephone Options
78 Avaya 1600 Series IP Deskphones Administrator Guide
Note:
Note: If the Ethernet line interface link fails, the 802.1X Supplicant, if enabled, enters
the Disconnected state. The 802.1X Supplicant variable userLogoff normally has
a value of FALSE. This variable will be set to TRUE before the telephone drops
the link on the Ethernet line interface (and back to FALSE after the link has been
restored). The userLogoff variable may also be briefly set to TRUE to force the
Supplicant into the LOGOFF state when new credentials are entered.
802.1X Pass-Through and Proxy Logoff
1600 Series IP Telephones with a secondary Ethernet interface support pass-through of 802.1X
packets to and from an attached PC. This enables an attached PC running 802.1X supplicant
software to be authenticated by an Ethernet data switch.
The IP Telephones support two pass-through modes:
● pass-through and
● pass-through with proxy logoff.
The DOT1X parameter setting controls the pass-through mode. In Proxy Logoff mode
(DOT1X=1), when the secondary Ethernet interface loses link integrity, the telephone sends an
802.1X EAPOL-Logoff message to the data switch on behalf of the attached PC. The message
alerts the switch that the device is no longer present. For example, a message would be sent
when the attached PC is physically disconnected from the IP telephone. When DOT1X = 0 or 2,
the Proxy Logoff function is not supported
802.1X Supplicant Operation
1600 IP Telephones that support Supplicant operation also support Extensible Authentication
Protocol (EAP), but only with the MD5-Challenge authentication method as specified in IETF
RFC 3748 [8.5-33a].
A Supplicant identity (ID) and password of no more than 12 numeric characters are stored in
reprogrammable non-volatile memory. The ID and password are not overwritten by telephone
software downloads. The default ID is the MAC address of the telephone, converted to ASCII
format without colon separators, and the default password is null. Both the ID and password are
set to defaults at manufacture. EAP-Response/Identity frames use the ID in the Type-Data field.
EAP-Response/MD5-Challenge frames use the password to compute the digest for the Value
field, leaving the Name field blank.
When a telephone is installed for the first time and 802.1x is in effect, the dynamic address
process prompts the installer to enter the Supplicant identity and password. The IP telephone
does not accept null value passwords. See “Dynamic Addressing Process” in the Avaya 1600
Series IP Deskphones Installation and Maintenance Guide. The IP telephone stores 802.1X
credentials when successful authentication is achieved. Post-installation authentication