Port Numbers for Messenger and Skype

I have a PC at home which is connected to the internet via a satellite dish and a GPRS mobile phone. I live in Spain and this is the only way I can connect to the internet. It's not as expensive as you may think.

My PC has XP Pro with SP2 and is using the Windows Firewall.

I am trying to get Skype and MSN Messenger Video Conferencing to work but I keep getting messages saying that the firewall is blocking some necessary ports. Does anybody know what these port numbers are?

With Messenger, I can type messages to my friends okay, but when I start a Video Conferencing or Audio Session it saying connecting for ages then gives up.

  Chegs ®™ 21:00 21 Nov 05

click here

Here's the info for Skype,Messenger doesn't appear to have any of these details available(despite my limited poking around in it)

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