TermGallery

Russian

Spanish

Traditional analog voice land line telephone service.

pots line
basic telephone service
telephone service
voice telephone service
land-line telephone service

land line

Voice-grade analog telephone service; the basic form of residential and small business service connection to the telephone network now gradually replaced by more advanced forms of telephony such as ISDN, mobile phones and VoIP.

pots
post office telephone service
post office telephone system
plain old telephone system

Its diminished presence parallels the steady erosion of demand for its original business: providing plain old telephone service over landlines. 
 Reuters 

Russian

потс pots

Spanish

pots plain old telephone service