placing an call on T28 with recent firmware

[Yealink Support]

Hi johandezwaan,

In version71, we use new format of the ACTION URI.
Please follow below format to control the phone.
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http(s)://phone IP address/servlet?key=variable value.
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When authentication is required, you must enter
“p=login&q=login&username=xxx&pwd=yyy&jumpto=URI&” before the variable
“key”. xxx refers to the login user name and yyy refers to the login password.

You can refer to more details from page 166 in below admin guide.
http://www.yealink.com/Upload/T2X/201410..._V72_1.pdf