Telephone

phonetelephonesLocal Telephone Servicefixed telephonyphonestelephonyFixed-Line TelephonyTelephone numbertelephone receiverfixed
A telephone, or phone, is a telecommunications device that permits two or more users to conduct a conversation when they are too far apart to be heard directly.wikipedia
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Consumer

consumersconsumer marketend consumer
As of 2006 many VoIP companies offer service to consumers and businesses.

Business

for-profitenterprisefirm
As of 2006 many VoIP companies offer service to consumers and businesses.

Uninterruptible power supply

UPSuninterruptible power suppliesbattery backup
Unless the IP telephone's components are backed up with an uninterruptible power supply or other emergency power source, the phone ceases to function during a power outage as can occur during an emergency or disaster when the phone is most needed.

Power outage

blackoutpower failureblackouts
Unless the IP telephone's components are backed up with an uninterruptible power supply or other emergency power source, the phone ceases to function during a power outage as can occur during an emergency or disaster when the phone is most needed.

Signage

signsignssignboard
Graphic symbols used to designate telephone service or phone-related information in print, signage, and other media include ℡ (U+2121), ☎ (U+260E), ☏ (U+260F), ✆ (U+2706) and ⌕ (U+2315).

Unicode

Unicode StandardUU+
Graphic symbols used to designate telephone service or phone-related information in print, signage, and other media include ℡ (U+2121), ☎ (U+260E), ☏ (U+260F), ✆ (U+2706) and ⌕ (U+2315).

Bell Memorial

Alexander Graham Bell Telephone MemorialBell Telephone Memorialmonument
Bell Telephone Memorial

List of telephone operating companies

List of telephone operating companies § Japantelecom companiesBrazilian telecommunications
List of telephone operating companies

Richard R. John

John, Richard RJohn, Richard R.
John, Richard R. (2010). Network Nation: Inventing American Telecommunications. Cambridge, MA: Harvard University Press.
Telephone

Area codes 518 and 838

518518 & 838838
Area codes 518 and 838 are telephone area codes in eastern U.S.A upstate New York.

Comparison of VoIP software

proprietary formatsSIP Softphones
This is a comparison of voice over IP (VoIP) software used to conduct telephone-like voice conversations across Internet Protocol (IP) based networks.

Area codes 815 and 779

815 & 779815779
Area code 815 is a telephone area code for most of northern Illinois outside the Chicago and Quad Cities areas.

Area code 709

709
Area code 709 is the telephone area code in the Canadian province of Newfoundland and Labrador, encompassing the whole province.

Area code 406

406+1 406Area code
Area code 406 is the telephone area code covering the entire state of Montana.

Area codes 918 and 539

539/918918 & 539918
Area codes 918 and 539 are telephone area codes serving Tulsa and northeast Oklahoma.

History of AT&T

SBCSBC CommunicationsAmerican Telephone and Telegraph Company
The history of AT&T dates back to the invention of the telephone itself.

Area codes 902 and 782

902782902 and 782
Area codes 902 and 782 are the telephone area codes in the Canadian provinces of Nova Scotia and Prince Edward Island.

Talk radio

Talknews/talkradio talk show
Talk radio typically includes an element of listener participation, usually by broadcasting live conversations between the host and listeners who "call in" (usually via telephone) to the show.

Area code 530

530
Area code 530 is a California telephone area code in northeastern and Northern California.

Area code 618

618217618/366
Area code 618 is the telephone area code serving southern Illinois, including the cities of Carbondale and Cairo.