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this is forever a problem i have had with msn messenger, which is why i have just given up assuming that it is supposed to work with voice and video.
i have noticed that certain combinations of routers on either end will cause one or both services not to work. with some early linksys routers nothing you could do would get it to work, but the latest iterations of them seem to work by default.
with dlink and netgear, it seems to work flawlessly only when you set your machine to DMZ host, but no combination of port forwarding seems to ever work right for both, though you can get file transfers and video to work most of the time.
with linux/freeBSD based firewalls, port forwarding gets everything to work.
now, you have to realize that both ends need to be working for these services to work. even if all your settings are good, the other end needs to have all their stuff together, although i have noticed that linksys on one end and dlink on the other occasionally has issues.
now for a real head scratcher.... i noticed one time that i had no problems using voice as long as i was connecting to my linksys router through wireless..... but it never connected with voice when i was connected through ethernet. this was even after numerous firmware upgrades.
yahoo video seems to work every time, but tends to crash the aplication as well. might be driver issues on my part, however it seems the connection problems are due mainly to your networking hardware, and not the voice or video hardware. it is something to consider how messenger works with its kind of token passing, where each distant end has to authenticate through the server individually and that you're never connected point-to-point with msn's voice and video. somewhere therein lies the issue with every router, and finding the settings to let that happen properly is what will get it working.
good luck!
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