Hi Ridho,
I removed your screenshot since I wasn't sure if it was meant to to be seen publicly. Since you are using SNMPv3 to try and scan the IP phone, I would recommend double checking if the Lansweeper credentials match the requirements of the phone. There have been cases where a security context was required for the device in order to scan it.
Alternatively, and if possible, you could scan the IP phone with SNMPv2 which should work provided it is enabled.