Installation guide

Advanced Operational Features
6-9 41-001561-00 REV00 – 10.2014
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 automati-
cally 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.
Missed Call Summary Subscription
The “Missed Call Summary Subscription” feature allows missed calls that have been redirected by the server, to be
incremented in the missed calls indicator on the phone it was initially directed to. This feature is called the Missed Call
Summary Subscription and can be set with a timer that allows the phone to use the feature for a period of time before
the timer expires. For this feature to work, you must configure voicemail on the phone that the call was initially directed
to.
For example, phones A, B, and C are connected to the server. You configure the server to direct calls coming into phone B
(which has voicemail configured) to be forwarded to phone C. When phone A calls phone B, the server forwards the call
to phone C. With this feature, phone B receives notification from the server that the call was forwarded and the missed
calls indicator is incremented on phone B.
An Administrator can configure this feature on a global or per-line basis using the configuration files.
Configuring Missed Call Summary Subscription using the Configuration Files
In addition to enabling/disabling the Missed Call Summary Subscription, You can also configure the amount of time, in
seconds, that the phone uses this feature. The timer is configurable on a global basis only.
You use the following parameters to configure Missed Call Summary Subscription feature on a global basis:
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.
Missed calls indicator increments on phone B.
Note: Voicemail must be configured on phone B