Yealink NOTIFY message to Auto-Answer

[komfushee]

Hello,

Is there a sip notify message that's handled by Yealink's phone that's auto-answering a call ?
The aim of this is to auto-answer an incoming call when the user has an headphone with microphone, without touching to the phone.
He just has to click a button on a webpage and the call is answered. But I don't want to use the URL request :

Code:

http://admin:admin@192.168.1.1/cgi-bin/ConfigManApp.com?Id=34&Command=1&Number=100&Account=101

Thanks.