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Ghost Calls

Ghost Calls are calls to your DT Client, when in SIP or Asterisk mode, that are dead air. You can get lots of these calls when it happens. It is due to an attack by a port scanner. the calls are not coming from the Phone System, but rather directly from the scanner to your public IP address.

Change IP Address

The quickest, but non-permanent fix, is to change your public IP address. For home users this might be simply rebooting your home router, or contacting your ISP to have it changed.

Block using Windows Firewall

A more permanent fix is to block traffic on the ports used for SIP traffic using your Windows Firewall. The steps are to 1) create a rule to block all traffic on ports 5060-5063 and then 2) create another rule to allow SIP traffic from the phone system. Here are the detailed steps:

1. Find Windows Firewall on your PC and go to Inbound Rules and click New Rule

a New Rule 1 b Rule 1 Type c Rule 1 ports d Rule 1 Action e Rule 1 Domains f Rule 1 Name

2. Now add the second rule

g New Rule 2 h Rule 2 Type i Rule 2 ports j Rule 2 Action k Rule 2 Users l Rule 2 Computers m Rule 2 Domains n Rule 2 Name

3. Find the second rule in the list of rules and open its properties. Set the IP address to that of your phone system

o Rule 2 Scope

There is no need to reboot your PC – the rules are automatically in place.