Q: What is Analog Telephone Adapter (ATA) ?
What is Analog Telephone Adapter (ATA) ?

A: A device that converts the analog signals from a conventional phone into a format acceptable for transmission over an internet connection, and vice versa at the receiving end. This device is commonly used for VoIP Phone Services.

Q: what is CPE ?
CPE is Customer Premises Equipment

A: Terminating equipment (such as terminals, telephones, and modems) supplied by the telephone company, installed at customer sites and connected to the telephone company network. Can also refer to any telephone equipment residing on a customer site.

Q: What is full duplex ?
What is full duplex ?

A: Phone calls are full duplex, meaning both parties can speak at the same time. Not all voice cards can support full-duplex operation so if you are using your PC to talk rather than a telephone with an ATA, you may have a half-duplex voice card

Q: What does the H323 means?
What does the H323 means?

A: A standard approved by the International Telecommunication Union (ITU) in 1996 to promote compatibility in videoconference transmissions over IP networks.

Q: what is ILEC ?
ILEC is Incumbent Local Exchange Carrier

A: Traditional telephone company. In the U.S., the Regional Bell Operation Companies (RBOCs) that were formed after the divestiture of AT&T and the Independent Operating Companies (IOCs) that usually are located in more rural areas or single cities are called ILECs.

Q: What is a top-level domain?
What is a top-level domain?

A: A top-level domain is the last part of a domain name. In englishclub.com, ".com" is the top-level domain. In englishclub.org.uk, ".uk" is the top-level domain.

Q: What are the generic top-level domains?
What are the generic top-level domains?

A: The multi-letter top-level domains (like .COM, .NET, .ORG etc) are called generic top-level domains (gTLDs). Click here for a long list.

Q: What are the country code top-level domains ?
What are the country code top-level domains ?

A: There is a 2-letter top-level domain for each country (for example: .FR for France, or .JP for Japan). These are called country code top-level domains or ccTLDs.

Afghanistan AF
Albania AL
Algeria DZ
American Samoa AS
Andorra AD
Angola AO
Anguilla AI
Antarctica AQ
Antigua and Barbuda AG
Argentina AR
Armenia AM
Aruba AW
Australia AU
Austria AT
Azerbaijan AZ
Bahamas BS
Bahrain BH
Bangladesh BD
Barbados BB
Belarus BY
Belgium BE
Belize BZ
Benin BJ
Bermuda BM
Bhutan BT
Bolivia BO
Bosnia-Herzegovina BA
Botswana BW
Bouvet Island BV
Brazil BR
British Indian Ocean Territory IO
Brunei Darussalam BN
Bulgaria BG
Burkina Faso BF
Burundi BI
Cambodia KH
Cameroon CM
Canada CA
Cape Verde CV
Cayman Islands KY
Central African Republic CF
Chad TD
Chile CL
China CN
Christmas Island CX
Cocos (Keeling) Islands CC
Colombia CO
Comoros KM
Congo CG
Cook Islands CK
Costa Rica CR
Croatia (Hrvatska) HR
Cuba CU
Cyprus CY
Czech Republic CZ
Czechoslovakia CS
Denmark DK
Democratic Republic of Congo CD
Djibouti DJ
Dominica DM
Dominican Republic DO
East Timor TP
Ecuador EC
Egypt EG
El Salvador SV
Equatorial Guinea GQ
Estonia EE
Ethiopia ET
Falkland Islands (Malvinas) FK
Faroe Islands FO
Fiji FJ
Finland FI
France FR
France (European Territory) FX
French Guyana GF
French Polynesia PF
French Southern Territories TF
Gabon GA
Gambia GM
Georgia GE
Germany DE
Ghana GH
Gibraltar GI
Greece GR
Greenland GL
Grenada GD
Guadeloupe (French) GP
Guam (US) GU
Guatemala GT
Guinea GN
Guinea-Bissau GW
Guyana GY
Haiti HT
Heard and McDonald Islands HM
Honduras HN
Hong Kong HK
Hungary HU
Iceland IS
India IN
Indonesia ID
Islamic Republic of Iran IR
Iraq IQ
Ireland IE
Israel IL
Italy IT
Ivory Coast (Côte D'Ivoire) CI
Jamaica JM
Japan JP
Jordan JO
Kazakhstan KZ
Kenya KE
Kiribati KI
Kuwait KW
Kyrgyzstan KG
Laos (People's Democratic Republic) LA
Latvia LV
Lebanon LB
Lesotho LS
Liberia LR
Libya (Libyan Arab Jamahiriya) LY
Liechtenstein LI
Lithuania LT
Luxembourg LU
Macau MO
Macedonia MK
Madagascar MG
Malawi MW
Malaysia MY
Maldives MV
Mali ML
Malta MT
Marshall Islands MH
Martinique (French) MQ
Mauritania MR
Mauritius MU
Mexico MX
Micronesia FM
Moldavia MD
Monaco MC
Mongolia MN
Montserrat MS
Morocco MA
Mozambique MZ
Myanmar MM
Namibia NA
Nauru NR
Nepal NP
Netherland Antilles AN
Netherlands NL
Neutral Zone NT
New Caledonia (French) NC
New Zealand NZ
Nicaragua NI
Niger NE
Nigeria NG
Niue NU
Norfolk Island NF
North Korea KP
Northern Mariana Islands MP
Norway NO
Oman OM
Pakistan PK
Palau PW
Panama PA
Papua New Guinea PG
Paraguay PY
Peru PE
Philippines PH
Pitcairn PN
Poland PL
Polynesia (French) PF
Portugal PT
Puerto Rico (US) PR
Qatar QA
Reunion (French) RE
Romania RO
Russian Federation RU
Rwanda RW
Saint Helena SH
Saint Kitts Nevis Anguilla KN
Saint Lucia LC
Saint Pierre and Miquelon PM
Saint Tome and Principe ST
Saint Vincent and the Grenadines VC
Samoa WS
San Marino SM
Saudi Arabia SA
Senegal SN
Seychelles SC
Sierra Leone SL
Singapore SG
Slovak Republic (Slovakia) SK
Slovenia SI
Solomon Islands SB
Somalia SO
South Africa ZA
South Korea KR
Soviet Union SU
Spain ES
Sri Lanka LK
Sudan SD
Surinam SR
Svalbard and Jan Mayen Islands SJ
Swaziland SZ
Sweden SE
Switzerland CH
Syria (Syrian Arab Republic) SY
Tajikistan TJ
Taiwan TW
Tanzania TZ
Thailand TH
Togo TG
Tokelau TK
Tonga TO
Trinidad and Tobago TT
Tunisia TN
Turkey TR
Turkmenistan TM
Turks and Caicos Islands TC
Tuvalu TV
Uganda UG
Ukraine UA
United Arab Emirates AE
United Kingdom UK
United States of America US
United States Minor Outlying Islands UM
Uruguay UY
Uzbekistan UZ
Vanuatu VU
Vatican City State VA
Venezuela VE
Vietnam VN
Virgin Islands (British) VG
Virgin Islands (US) VI
Wallis and Futuna Islands WF
Western Sahara EH
Yemen YE
Yugoslavia YU
Zambia ZM
Zimbabwe ZW