Yealink Yealink SIP-T42G, Administrator'S Manual

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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 .