What router i can use to connect 2 or more dsl lines?

i work for company with multiple dsl connections. I would like to combine these dsl lines into one using a device. i know that there is a hardware that can answer the problem. Dlink DSL500 is one but it can only connect two dsl lines. If there are other easy to install/implement hardware that can accomodate 4 or... show more i work for company with multiple dsl connections. I would like to combine these dsl lines into one using a device. i know that there is a hardware that can answer the problem. Dlink DSL500 is one but it can only connect two dsl lines. If there are other easy to install/implement hardware that can accomodate 4 or more dsl lines, please help me find it. or other brand other than Dlink. a wireless capability would be better.

thanks in advance.
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