Windows Messenger Voice/Video Problems

I am having problems getting voice/video to work on Windows Messenger V4.7 in XP SP2.

The following features work fine:
1.  Remote desktop
2. Instant Messaging
3. File Transfer

The following do not work:
1.  Voice
2. Video
3.  App sharing

I have a Netgear DG834 (with the latest firmware) with the following ports forwarded:
1.  Appshare TCP 1503
2.  Remote Desktop  TCP3389

1.  Appshare TCP 1503
2.  Remote Desktop 3389
3. Voice 6901
4.  File transfer 6891-6900
5. Streaming video 5004-65535
6.  TCP 1863
7. UDP 1863
8. UDP5190

I have these set on, but its not clear to me whether they should be set on (doens't make any difference)

PS does anyone know why Skype voice works effortlessly and Messenger is such a pain?!

Thank you

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do you have the same difficulty with your firewall disabled?
As I stated before, I had the same problem till I upgraded windows messenger. The other alternative would be to use MSN Messenger 7.0.
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