Problem whith SNAT clients and yahoo messenger

Dear friends
Its my bigest Problem.I have an isa server Which installed in integrated 
mode.As externel interface i use my modem.Also i have an internal Network Whith 
a range of private IPs(192.168.0.1-254).As the first problem my SNAT Clinets 
culdnot connect to yahoo messenger.For solving this problem i defined a 
protocol whith this settings: TCP port 5050 and outband direction 
and i used from this protocol definition in my protocol rule after doing this 
solved my problem and i can connent to yahoo massenger but yet i have another 
big problem.SNAT clients yet cannot use from Voice and Webcam whith yahoo 
messenger.For solving this problem i defined these protocols
1- Tcp port 5001 whith outband direction
2- Udp Port 5055 whith Send&Recieve direction
but when SNAT clients try to use this protocol they will have computer 
crash.What i must do? 

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