Normally, you would have to establish additional IDF somewhat closer to your far end so that your length will go below 300FT. If this is not a critical application though, such as analog phone or fax, and the cost of the additional IDF (space, patch panel, power outlet, mounting hardware) is not easily justify-able, you could get away with just labeling this port as non-standard.
If we were not talking about just one or two cables, I would strongly recommend looking at additional IDF option. You never know how would you need to use the cables few years down the line, and the short-term savings for placing longer cables could be wiped off by additional expense of running more cables in future.
Dmitri Abaimov, RCDD