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Advanced Operational Features
41-001343-02 REV04 – 05.2014 6-9
Auto-discovery Using mDNS
The IP phones can perform an auto-discovery of all servers on a network using mDNS. When the IP phone discovers a TFTP
server, it is automatically configured by that TFTP server.
An unconfigured phone (phone right out of the box) added to a network, attempts to auto-discover a configuration server
on the network without any end-user intervention. When it receives DHCP option 66 (TFTP server), it automatically gets
configured by the TFTP server.
An already configured phone (either previously configured by auto-discovery or manually configured) added to a net-
work, uses its predefined configuration to boot up.
Single Call Restriction
On the 6757i CT and 9480i CT, an administrator can enable or disable a single call restriction between the 6757i CT and
9480i CT base unit and a call server.
When this feature is enabled (set to 1), you can make separate active calls from the 6757i CT and 9480i CT base unit and
from the cordless handset. If this feature is disabled (set to 0), only one call can be active at a time either from the base unit
or from the handset. When this feature is disabled, and you make an active call on either the base unit or the handset, any
other attempt to make an active call is put on hold. Also, when this feature is disabled, more than one call can negotiate
complex audio codecs since only a single call is decoding audio at a time.
You can configure this feature via the configuration files or the Aastra Web UI.
Notes:
• Configuration parameters received via DHCP do not constitute configuration information, with the exception of a
TFTP server. Therefore, you can plug a phone into a DHCP environment, still use the auto-discovery process, and still
allow the use of the TFTP server parameter to set the configuration server.
• DHCP option 66 (TFTP server details) overrides the mDNS phase of the auto-discovery. Therefore, the DHCP option
takes priority and the remaining process of auto-discovery continues.
• As the phone performs auto-discovery, all servers in the network (including the TFTP server), display in the phone
window. However, only the server configured for TFTP automatically configures the phone.
Note:
Applicable to the 6757i CT and 9480i CT IP Phones only.