• Unlocked, can register to any other SIP Server 　
  
• Same MAC address on label and firmware inside .
  
• Free to do pre-configure and locking your company's SIP information. Bring Your Own Device(BYOD). Once the devices were locked with your SIP server, people could not reset it to factory default setting by menu or IVR unless he is authorized by you to get the administration password; he can only use your company's VoIP service with the devices forever!