Yealink SIP-T48G

Configuring Advanced Features
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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.