Yealink SIP-T48G Administrator's Guide

Configuring Advanced Features
555
This method is especially useful for users always working in the small office/home office
where a secure firewall may prevent the HTTP or HTTPS GET request from the external
network.
Note
Example of a SIP Notify with the variable value (OK):
Message Header
NOTIFY sip:3583@10.2.40.10:5062 SIP/2.0
Via: SIP/2.0/UDP 10.2.40.27:5063;branch=z9hG4bK4163876675
From: <sip:3586@10.2.1.48>;tag=2900480538
To: "3583" <sip:3583@10.2.1.48>;tag=490600926
Call-ID: 2923387519@10.2.40.10
CSeq: 4 NOTIFY
Contact: <sip:3586@10.2.40.27:5063>
Max-Forwards: 70
User-Agent: Yealink SIP-T23G
Event: ACTION-URI
Content-Type: message/sipfrag
Content-Length: 6
Message Body
key=OK
The following table lists pre-defined variable values:
Variable Value
Phone Action
OK
Press the OK/√ key.
ENTER
Press the Enter soft key.
SPEAKER
Press the Speakerphone key (not
applicable to CP860 IP phones).
F_TRANSFER
Transfers a call to another party.
VOLUME_UP
Increase the volume.
VOLUME_DOWN
Decrease the volume.
MUTE
Mute a call.
F_HOLD/HOLD
Place an active call on hold.
F_CONFERENCE
Press the Conf soft key.
If you want to only accept the SIP NOTIFY message from your SIP server and outbound
proxy server, you have to enable the Accept SIP Trust Server Only feature. For more
information, refer to Accept SIP Trust Server Only on page 260.

Yealink SIP-T48G Specifications

General

Expansion module support	Yes
Handset type	Wired handset
Product type	IP Phone
Product color	Black
Volume control	-
Display diagonal	7 \
Display resolution	800 x 480 pixels
Lines quantity	- lines
Phonebook capacity	1000 entries
Number of VoIP accounts	6
AC adapter input voltage	100 - 240 V
Number of handles included	1 pc(s)

Weight and Dimensions

Width	266 mm
Height	185 mm