Specifications

XML Browser Developer’s Guide for Yealink SIP-T4X IP Phones
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In addition, Yealink IP phones support accepting SIP NOTIFY messages from a SIP
proxy server, and act as a limited web server. For more information on how to
configure the XML SIP Notify, refer to Configuring the XML SIP Notify.
Figure2 Yealink IP phone acting as a server (HTTP(S) post)
Figure3 Yealink IP phone acting as a server (SIP NOTIFY)