Yealink SIP-T4X Administration Manual page 253

Administrator's Guide for SIP-T4X IP Phones
A remote phone book is placed on a server, while a local phonebook is placed on the IP
phone flash. A remote phone book can be used by everyone that can access the server,
while a local phonebook can only be used by a specific phone. A remote phone book is
always used as a central phonebook for a company; each employee can load it to
obtain the real-time data from the same server.
Both user name and register name are defined by the server. User name identifies the
account, while register name matched with a password is for authentication purposes.
Display name is the caller ID that will be displayed on the callee's phone LCD screen.
Server configurations may override the local ones.
IP phones support remote reboot by a SIP NOTIFY message with "Event: check-sync"
header. The parameter "reboot=true" makes the IP phone reboot immediately after
receiving the NOTIFY message. The message is formed as below:
NOTIFY sip:<user>@<dsthost> SIP/2.0
To: sip:<user>@<dsthost>
From: sip:sipsak@<srchost>
CSeq: 10 NOTIFY
Call-ID: 1234@<srchost>
Event: check-sync;reboot=true
You can press the volume key to increase or decrease the ringer volume and receiver
volume. Press the volume key to adjust the ringer volume when the phone is idle, or to
adjust the volume of the engaged audio device (handset, speakerphone or headset)
when there is an active call in progress.
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