Aastra OpenCom 100 Series Mounting And Commissioning User Manual page 132

Voice over IP (VoIP)
If you want to use both features concurrently, change the Status setting on the
Network: DHCP page to "Dynamic and static address assignment".
If you operate another DHCP server in your network, the Aastra 673xi/675xi can distin-
guish the different DHCP answers and will normally take its configuration data from
the OpenCom 100 communications system nevertheless. In a conflict situation, you
may need to prevent the configuration of the Aastra 673xi/675xi SIP phone by a
foreign DHCP server. For example, add an exception rule for all MAC addresses
starting with 00:08:5D.
The TFTP server of the OpenCom 100 communications system will serve up to 4 con-
current data transfers. To avoid overloading the TFTP server (e.g. after a power failure),
additional devices may get an IP address from the DHCP server with a delay. The allo-
cation of IP addresses will restart if the TFTP server indicates the end of the overload
situation.
Aastra 673xi/675xi Hot Desking
The Aastra 673xi/675xi SIP phones support the "Easy Configuration / Hot desking"
feature. This feature allows a user to operate his personal configuration on any desired
Aastra 673xi/675xi of equal type.
To prepare a Aastra 673xi/675xi for Hot Desking, you can configure a function key
with the "Logout" function. If this function key is pressed, the currently assigned
device entry will be marked as "Logged Out" and the Aastra 673xi/675xi restarts. You
can indicate logged out device entries in the Configurator on the Telephony:
Devices: VoIP Phone page by their shortened MAC address.
After restart, the logged out Aastra 673xi/675xi will show a login page. A user can
enter his call number and his user PIN. If a device entry with this call number exists
and has the same device type, the login procedure continues. If the device entry is
currently active on another device, the associated remote Aastra 673xi/675xi will be
logged out automatically and will show a login page on its part. The now logged in
Aastra 673xi/675xi starts and will get its configuration from the newly assigned device
entry.
Note
When adding the device entry, it is also possible to activate the Logged out option.
130