What are 'Ghost Calls' and how do you deal with them?

Do you use VoIP in the business? Do you sometimes receive random phone calls from strange numbers, such as 1000, 1001 that do not exist in your infrastructure?

If you do, there is usually a simple fix.

Step 1, is to change your default SIP port from 5060 if the handset is still set to this. You can log into the phone manually to change this, and use something like 5065, 5066, 5067.

Alternatively, you can speak your VoIP provider, but hopefully this will already be set to an alternative anyway.

If you are using a Yealink handset, you may need to make some further changes.

If you follow the steps below, this should resolve your problem.

Log into the phone interface via your browser. This can my found from your handsets on screen network settings.

Please disable the Allow IP Call and Enable the Accept SIP Trust Server Only.

1. Disable IP Call feature:

IP Call feature allow the SIP phone to make and receive calls by IP address

(Without SIP account)

1.1 Change by WEB UI path: Features->General Information-> Allow IP Call

（A yealink T32G/T38G model cannot support configure it through the web UI）

1.2 Change by Auto provisioning parameter:

# 0-disable; 1-enable; default value is 1 (Enable)

features.direct_ip_call_enable =

Each phone manufacturer will vary for a fix to the problem, but the best starting point is to ensure you always have the latest firmware installed for you phone.