If you are using a Firewall, Router or Security software, these must be configured to allow iVisit through on the following ports.
OUTGOING:

• Local UDP port 9940 (sometimes called local source port)
• Remote UDP port (ALL) (sometimes called remote destination port)

INCOMING:

• Local UDP port 9940 (sometimes called local destination port)
• Remote UDP port (ALL) (sometimes called remote source port)

Click here for more router details

Remake it by doing the following:
In the main Address Book > Places window at the Blue Plus type
ivisit.net
Then hit the 'return/enter' key

On the iVisit Settings/Network Settings Menu

• For Cable, ADSL and ISDN set to 500/500
• For Dial-Up set to 400/400 (Default)

If you want to limit your date use (perhaps your ISP imposes usage Caps) you can set these to lower values but be aware that this will impact on the video frame rates and audio quality.

IPChain configuration, add the following:
IPChain Loose option to activate.
echo "1" > /proc/sys/net/ipv4/ip_masq_udp_dloose

Very occasionally users may need to set the MTU (sometimes called the Path of Discovery) to match that of their provider or router manufacturer, for more help with setting your MTU click here

Possible error messages:

"User unknown" or "Wrong Calling Code"

• Do you have their full Username.#### in your Address Book > People?
• Do you have their Username spelt correctly?
• Does the person you are attempting to contact have an iVisit Account?

"No answer"
Are they online - is there a green dot next to their name in the People section of your Address Book?
The person you are attempting to call must be online. If you see "No answer" they may be away from their computer, not answering your call or simply, not online.

"User unreachable" or "Disconnected" when in room with them.
This means that iVisit is unable to establish a connection with the user on UDP Port 9940
Are you using a router? Be sure to update your router's Firmware, configure the ports (see Basic Network/Router Configuration above) and reboot the network as follows:

• Turn off the computers, the router, the modem, then turn them back on in exactly the following order:
  1. Modem
  2. Router
  3. Computer you will use on iVisit

"Blocked"
The user you are trying to call has set you as "Blocked" in their Preferences, no calls or Messages will get through to them.

"Busy"
Busy means exactly that, this person has chosen to be "busy" or have accidentally set their incoming call status to hold all calls. More about call status, click here. If you receive a "Busy" response you can still leave a message for that person to retrieve later.

"Temporarily unavailable" or "Server unreachable"
Check your Network, Internet connection and Firewall.

Click Address Book > People > Blocked and drag their name out of the trash can.

Connections may "Time-out" if:

1. iVisit is no longer running on the other machine
2. The other machine has lost its connection to the Internet
3. Some link in the Internet which the data must travel over is broken or heavily congested

For more details on how iVisit connections work click here

Create a plain text file called "config.ivb" using Notepad (on PC) or SimpleText/TextEditor (on Mac). Type in these 2 lines:

• s=1
• local_port=9941

"local_port" can be any value > 1024 (and less than 65535).
Save this file (Save As config.ivb) to the same folder as the iVisit application. (This will typically be c:\Program files\iVisit\ on the PC and \Applications on the Mac)
The next time you start iVisit, the new port should show in your Network Stats window. This is also potentially useful for folks that have multiple iVisit's running behind the same NAT.
Right click (PC) or ctrl-click (Mac) here to save this sample config.ivb that you can edit.