Good after noon all .

now im not sure ful if i missed some thing when im trying to set up router :) so im after some help and i have more than likly just missed somethig :) 

ok i have a block of ip from my ISP being 

xxx.xxx.xx.166  

xxx.xxx.xx.165

xxx.xxx.xx.166

xxx.xxx.xx.167 

first ip unsuable as its network address 

last ip is unusable as broadcast address 

second ip is assigned to router 

other can be used for what ever i like 

this is the info from my ISP . 

now the internet works fine :)  what i would like to do is use the 166 to go stright to my PBX/VOIP :)  now the 165 with port number on it :xxxx will go to pbx and the 166 with port number will go to pbx , as i have set virtual servers . is there a way to just let the xxx.xxx.xx.166 through to the pbx and not the xxx.xxx.xx.165  the ip address are from the ISP not internal IP addresses .

regards steve