******Exist call:1
sid0:2bd4a7c8d0001e49e97dc332d6bf619e sid:2bd4a7c8d0001e49e97dc332d6bf619e
user:1491953482

******Exist call:2
********different   sid0:2bd4a7c8d0001e49e97dc332d6bf619e sid:bcd0c39467ce09c5b5be9910f9e1798b
user:undef-as-string

******Exist call:3
********different   sid0:abcd sid:2dd5bc5bc5e297150b1e4c7f58166135
user:undef-as-string