Installation
3.Set the tone/pulse switch. If you have touch tone service, set the switch to TT (tone). If you have dial pulse (rotary) service, set the switch to DP (pulse).
Tone/pulse switch
4.Connect the handset to the telephone. Plug the handset coiled cord into the handset jack on the left side of the telephone base. Plug the other end of the handset coiled cord into the handset, then hang up.
5.Connect the telephone line cord to the telephone. Plug the telephone line cord into the jack labeled LINE IN on the telephone base as shown below. If you subscribe to high- speed internet service (Digital Subscriber Line - DSL) through your telephone line, you must have a DSL filter between the telephone base and the telephone wall jack. The filter will prevent noise and caller ID problems caused by DSL interference. Please contact your DSL service provider for more information about DSL filters.
Telephone wall jack
DSL filter (not included) required if you have DSL 
Telephone line cord
6.Check for a dial tone. Lift the handset or press 
to listen for a dial tone. If you cannot hear a dial tone, slide HS VOL (handset volume) or SPK VOL (speakerphone volume) upward. If you still do not hear a dial tone, see the Troubleshooting section on page 14 of this user's manual.