Ghost calls

Summary

Some users on home networks occasionally report receiving calls that they are unable to answer. When they answer the phone, there’s no one at the other end of the phone (or dead air). Typically the phone displays a caller ID like “100”, “1000”, or “3000”.

There are referred to as phantom calls or ghost rings and are essentially the phone equivalent of Spam emails.

Quick Fix

If you are experiencing phantom calls and cannot make changes to your router, you can set your phone to “Do Not Disturb” when you do not want to receive calls — such as the middle of the night.

Technical Fix

To stop these calls from happening, you need to:

1. Check the type of firewall that you have and verify if it has applied filters to block these types of calls.
2. Set the phone behind a firewall that is not subjected to internal broadcasts or various wifi device traffic.

You may also apply these suggested setting into your router:

1. Open ports 5060 on UDP & TCP and also ports 16384 through 32767 UDP
2. Enable Persistant NAT if available, or…
3. Increase NAT/UDP timeout to 60 seconds or higher
4. Disable SPI (Stateful Packet Inspection)
5. Disable SIP ALG

Contact your IT provider if you need help applying any of these settings. If they are unavailable to help, please contact our Support team at 858-836-0700 option 1 or email us at support@nextlevelinternet.com.