1/M-3/F-PHONE-SPLITTER - NECABLES - Phone Jack Splitter 2 Line Adapter RJ11 1 Male to 3 Females (L1, L2, L1+L2) and 1pc Telephone Line Coupler White

The telephone splitter 2-line adapter consists of one RJ11 plug for input and three RJ11 jacks for output, it allows you to split a single 2-line phone jack into dual separate jacks, e.g. L1 for one phone number and L2 for another, L1 for phone number and L2 for fax number, L1 for phone number and L2 for modem etc. At last, the L1+L2 jack can take care of both of the two lines. 

Telephone inline coupler RJ11 jack to RJ11 jack, it's commonly used as a phone cord extender and allows you to extend your existing telephone line