I have a customer with a dk280 with a rctub2 processor who wants to extend his office to include a trailer about 100 yards across the street. I see no way to run lines. What are my options. He wants to be able to transfer calls to the new location. What would be required to install an off premise extention using the local bell company's line. I am not familiar with tie lines. Would that be an option.
JBW