Call is not going through and not shown in Last Calls

• Make sure that configuration is correct on Caller side and it is really sending call to right IP (your server IP).
• Make sure that iptables are not blocking Caller IP on server side. Command to do that:

# iptables -L -n | grep DROP | grep 11.22.33.44

Where 11.22.33.44 is Caller's Public IP address.

If IP is blocked by iptables in your server output, will look like this:

DROP       all  --  11.22.33.44        0.0.0.0/0

If you are not getting such line, IP is not blocked by iptables on your server.

To unblock IP:

iptables -nL --line-numbers | grep 11.22.33.44

output will be like:

4    DROP       all  --  11.22.33.44       0.0.0.0/0

notice that first number and then place in following command to delete rule which block IP:

iptables -D INPUT 4

After this command IP will be unblocked.

To add IP to whitelist so it would not be blocked again by fail2ban:

Open file /etc/fail2ban/jail.conf with you favorite text editor.

Find the line which starts with

ignoreip = 127.0.0.1

add IP which was blocked to end of this line so it would look like that:

ignoreip = 127.0.0.1 11.22.33.44

restart fail2ban service to apply changes:

service fail2ban restart