How to Block Ghost Calls on Grandstream IP Phones

How to Block Ghost Calls on the Phones

Description

Ghost calls will usually affect the phone level. You may find it annoying by getting authorized calls. You can increase the security on the affected phone by setting the following parameter to YES in Grandstream IP Phones – GXP16XX/17XX/21XX and HT8XX ATAs models.

  • Validate Incoming Messages
  • Check SIP User ID for Incoming INVITE
  • Accept Incoming SIP from Proxy Only
  • Authenticate Incoming INVITE
  • Anonymous call rejection option
Figure 1: Security Settings under Grandstream IP Phone’s Accounts
Figure 2: Set Yes to Anonymous Call Rejection

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