I tried the settings you mentioned but it didn't worked.
Settings I did is admin > advanced > phone
I am doing settings on line extention 4
Extension : Disabled
Short Name : Test
Share Call Appearance : private
Extended Function :fnc=blf+sd+cp;sub=
te...@paridhi.xyz.com;nme=1002
Then admin > advanced >Attendant Console
Server Type : Asterisk
Now when I call device to device 1001 -----> 1002, the VOIP phone should show the status of the phone because we have used extention 1002 in extended function that is busy. But Line extention 4 is not responding even not on normal calls.
Does someone knows about it?