*If* you have ChanServ on the network you can try this command: /msg chanserv invite #channel After being invited to the channel and joining it you can remove +i.
When you are on a network with services as Nickserv and Chanserv, you just have to indentify your nick with Nickserv and when you are on the Access-List as Op of the Channel, you can use "/mode #Channame -i" for your interest.