... power call selector is suitable for people who have 2 outgoing telephone lines but want to use one single ... much space of the desk if adopts 2 telephone sets for the 2 outgoing lines. We can solve the ... single telephone set, and it is convenient to use. 2. People have installed a new lower rate telephone line, ... , easy to use. 3. One telephone set and 2 outgoing lines, both lines can call out and the ...