Ok, trunks usually have the code 7100, 7101, 7102...you get the idea unless someone didn't put line apearences in 1a2 key emulation. The other possiblity is they used ring groups ala t1 for this and 500 might be code 126 00 500, 126 00 501...you get the idea. You wont need a pase..simply put 9+number under the key.