Unwanted calls with the Grandstream phone adapter

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Thank you for contacting Hivoox Telecom, Support center.

It's possible to block such calls by setting up some security parameters on the phone.
Please browse to the web GUI of the phone and the following options to YES :

- Check SIP user ID for Incoming INVITE 
- Accept Incoming SIP from Porxy Only

And also kindly upgrade the phone to the latest firmware version, and let us know your feedback.

Best regards, 

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Founded by professionals with over 20 years of experience in the information technology and telecommunications, Hivoox Telecom is a voip service provider that offers services to businesses around the world.