Plain Old Telephone ServicePlain Old Telephone Service, or POTS, are the services available from an analogue telephones prior to the introduction of electronic telephone exchanges into the public switched telephone network. These services had been available almost since the introduction of the telephone system in the late nineteenth century.
These services included:
- Bi-directional, or duplex, speech path,
- Dial Tone and Ringing Signals,
- Subscriber Dialing,
- Operator Services, such as directory assistance and long distance and conference calling assistance.
- Voice Mail
- Caller Identification
- Call Waiting
- Reminder Calls
- (Three Way) Conference Calling
- Enhanced 911
The new services were made possible by the introduction of the support network for the ISDN as well as raised consumer expectations from services offered on mobile telephones.
The system now known as the Plain Old Telephone Service was originally knowns as the Post Office Telephone Service or Post Office Telephone System. The term was dropped as telephone services were removed from the control of national post offices.