This method is less efficient for coin phones, which need special signalling. In urban areas, they were served by older exchanges that had separate junctors for coin phones. Where the 5XB was the only exchange, a number of work-around methods were devised. Regular and coin phones shared the more complex and expensive coin trunks, or else separate routes were established, or coin trunks connected via tandem switches including the 5XB itself acting as its own tandem. In this last case, the call had to use two connections through the switching fabric: one to connect the line to the coin supervision trunk and another to connect that trunk to the outgoing trunk.