These settings relate to the ability to connect over a network or the internet. Most of the options here are fairly advanced, so don't change them unless you understand them fully. This section is intended for network administrators or like-minded individuals.

Listening Local Port

Local SIP Port to listen on

The UDP port on your computer that will be used to create a SIP signaling connection. The default port used here is 5060*. If you have some other SIP software running on your computer you can pick another number (say 5061) to avoid a conflict.

Starting Local RTP port to listen on

The UDP port on your computer that will be used to for the audio connection. The default port here is 8000*. If that port is being used by another application, you can change this setting to a different port. All RTP ports must be even numbers (e.g. 8002, 8004, etc.).

Allowing Incoming Calls and Audio through Private Networks

These options all relate to the ability of your computer to find and communicate its external IP address so it can register a contact IP so other callers from the internet can find your computer's IP. If your computer cannot determine what its external IP address is, you will have problems receiving and conducting phone conversations. People with computers behind NATs or firewalls should pay careful attention to this section!

Use UPnP to find external IP address

Uses the Universal Plug 'n' Play protocol to determine your external IP address. Note that if you are using Microsoft Internet Connection Sharing (ICS) over a LAN, you may need to enable the UPnP. To do this, on the computer running Internet Connection Sharing select Start -> Connect To then right click on the internet connection then select Properties -> Advanced then tick the option "Allow other Internet Users to control the shared connection".

Use STUN to find IP address and port

Uses the "Simple Traversal of UDP protocol through NAT" technique to ask a server on the Internet if you are behind a NAT or firewall, and if so, what your external IP address is. The default server addresses listed only need to be changed if both STUN servers are offline - in other scenarios you can leave them as they are.

Use static IP address and static mapped ports (Advanced Options)

This is where you can enter your external IP address and SIP/RTP ports if your computer or the gateway computer on your network connects to the Internet using a static IP address. Again, the default SIP and RTP port settings are 5060 and 8000 respectively.

If you are having problems making phone conversations and suspect the issue is network-related, then click the "Run Network Setup Wizard" button in order to launch a wizard that will guide you through the network troubleshooting process.

If you want to reset all the information in this tab back to its default values, click the "Restore Default Network Settings" button.

* You must open this port on your firewall

IP Blacklist (Web Control Panel only)

Axon has the ability to blacklist IP addresses that continuously attempt to log in with bad credentials (see: Brute Force Security). This can prevent attacks intended to gain access to VoIP accounts that do not belong to the individual trying to obtain them. In some cases users may have difficulty getting their credentials set up correctly and as a result they may become blacklisted by sending an invalid password too many times. If you see a log message like "SIP Request from blacklisted address ignored: 1.2.3.4", then that address has been blacklisted, but is still attempting to talk to the Axon server. If the address should be allowed access, you will need to remove it from the blacklist before the client can reconnect, even if the password has been corrected.

• Brute Force Security