Functioning of FriendCaller app on Nokia S40 requires SIP client conversion by using Internet telephony installation Wizard. Free FriendCaller to FriendCaller and low cost International calls to landlines and mobile phones can be made using compatible Nokia phones. FriendCaller is fully compatible with SIP (RFC 3261) which is used and supported by major VoIP providers and companies like Cisco, Vonage, Comcast, Motorola, Nokia, Huawei and many more. The technology used by FriendCaller is hosted by a SIP-compliant backend infrastructure with media relay, presence services and SIP proxy.

Area code 816

816area code 816975
However, in 1951 a third NPA, area code 417, was created for the southwest, including the cities of Branson, Joplin, and Springfield. By late 1996 the proliferation of cell phones, especially in the Kansas City area, and other market reforms related to deregulation by the Telecommunications Act of 1996, required that northwestern Missouri received an additional area code. The supply of telephone numbers was further limited because the Kansas City LATA extends some distance into eastern Kansas, meaning that several numbers in area code 913, the area code for most of the Kansas side of the Kansas City area, were not available for use.

Telecommunications in Ethiopia

telecommunicationthe telecommunications market
Telecommunications in Ethiopia is a monopoly in the control of Ethio Telecom, formerly the Ethiopian Telecommunications Corporation (ETC). As of 2012, 20.524 million cellular phones and 797,500 main line phones were in use.

Area code 440

440area code 440
* List of Ohio area codes * List of NANP area codes * List of exchanges from, 440 Area Code * List of Ohio area codes * List of NANP area codes

Network equipment provider

NEPnetwork equipment providernetwork equipment providers
* Fixed networks which are typically based on PSTN (Public Switched Telephone Network).

Phone hacking

phone hackingvoicemail hackinghacked into her mobile phone
To prevent subscribers from choosing PINs with weak password strength, some mobile phone companies now disallow the use of consecutive or repeat digits in voicemail PIN codes. During the mid-2000s, it was discovered that calls emanating from the handset registered against a voicemail account were be put straight through to voicemail without the need of a PIN. A hacker could use caller ID spoofing to impersonate a target's handset caller ID and thereby gain access to the associated voicemail without a PIN.

Telephone numbers in Belize

The Belize telephone numbering plan is the system used for assigning telephone numbers in Belize. * Country calling code: +501 * International call prefix: 00 * National significant numbers (NSN): seven digits.


Third party call control3pcc
In the traditional telephony context, third party call control allows one entity (which we call the controller) to set up and manage a communications relationship or telephone call between two or more other parties. Third party call control (referred to as 3pcc) is often used for operator services (where an operator creates a call that connects two participants together) and conferencing. Similarly, many SIP services are possible through third party call control. These include the traditional ones on the PSTN, but also new ones such as click-to-dial. Click-to-dial allows a user to click on a web page to speak to a customer service representative.

Outline of telecommunication

List of basic communicationsoutlineTelecommunication
* E-mail * Fax * Instant messaging * Radio * Satellite * Telegraphy * Telephony * Television broadcasting * Videoconferencing * VoIP Telecommunications network * Computer networks * ARPANET * Ethernet * Internet * Wireless networks * Public switched telephone networks (PSTN) * Packet switched networks * Radio networks * Television networks Telecommunication * Analog * Digital * Optics * Modulation * Amplitude modulation * Frequency modulation * Quadrature amplitude modulation * Nyquist rate * Nyquist ISI criterion * Pulse shaping * Intersymbol interference * Physical media for Telecommunication * Twisted pair * Coaxial cable * Optical fiber * Telecommunication

Area code 316

316area code 316
But by the mid-1990s, the pool of available exchange codes in area code 913 was being exhausted due to rapid population growth on the Kansas side of the Kansas City metropolitan area–particularly Overland Park and Johnson County–as well as the proliferation of cell phones and pagers. Late in 1996, the Kansas Corporation Commission (KCC), which oversees telecommunications in the state, requested relief from the North American Numbering Plan Administration (NANPA) for the exchanges of area code 913, and on February 12, 1997, the NANPA responded by splitting most of northern Kansas from area code 913 into the new area code 785.

Telephone numbers in Fiji

Country Code: +679; International Call Prefix: 00 or 052; National Significant Numbers (NSN): seven-digits; Format: +679 yyy xxxx Fiji has no area codes and no leading trunk "0". The first digit of the number indicates usage or location. All telephone numbers are seven digits long. Mobile telephones are also seven digits long and begin with a 7 or a 9. The international access code is 00 or 052 depending on whom it is routed through: 00 is through FINTEL and 052 through Telecom Fiji. * Telecommunications in Fiji

Outline of the United Nations

UN Days of Observance
switched telephone network * Q.931 * R interface * Registration, Admission and Status * Remote Operations Service Element protocol * S interface * Signalling Connection Control Part * Signaling System 7 * Specification and Description Language * Symmetric High-speed Digital Subscriber Line * T.120 * T.37 * T.38 * T.50 * T.61 * T.82 * TTCN * Telecommunications Management Network * Teletex * Transaction Capabilities Application Part * U interface * Up0-interface * V.24 * V.92 * Very-high-bit-rate Digital Subscriber Line 2 * Virtual terminal * X.121 * X.21 * X.25 * X.400 * X.500 * X.509 * XML Encoding Rules * Marc Bélanger * International Labour Conference * Declaration

Automated attendant

automated attendantauto attendantauto-attendant
Modern AA services (which now overlap with more complicated interactive voice response or IVR systems) can route calls to mobile phones, VoIP virtual phones, other AAs/IVRs, or other locations using traditional land-line phones. Telephone callers will recognize an automated attendant system as one that greets calls incoming to an organization with a recorded greeting of the form, "Thank you for calling .... If you know your party's extension, you may dial it any time during this message." Callers who have a touch tone (DTMF) phone can dial an extension number or, in most cases, wait for operator ("attendant") assistance.

Area codes 210 and 726

210726area code 210
Area codes 210 and 726 are North American telephone area codes for numbers in and near San Antonio, Texas. They are enclave area codes, similar to area code 312 in Chicago, area code 316 in Wichita, Kansas, area codes 385/801 in Salt Lake City, Utah & 412/878 in Pittsburgh, Pennsylvania, in that it is completely surrounded by area code 830. The main area code, 210, was created November 1, 1992, in a split from area code 512. It covered the San Antonio area, most of the Hill Country, and the Rio Grande Valley.

Voice phishing

vishingvoice phishing
Features such as caller ID spoofing (to display a number of their choosing on the recipients phone line), and automated systems (IVR). Voice phishing is difficult for legal authorities to monitor or trace. To protect themselves, consumers are advised to be highly suspicious when receiving messages directing them to call and provide credit card or bank numbers—vishers can in some circumstances intercept calls that consumers make when trying to confirm such messages. * 1) The criminal either configures a war dialer to call phone numbers in a given region or list of phone numbers stolen from an institution.


US and UK systems had actual telephone dials, and prior to 1981 five U.S. area codes were reserved for teletype use; German systems did "dialing" via the keyboard. Typed "chat" was possible, but because billing was by connect time, it was common to prepare messages on paper tape and transmit them without pauses for typing. * Leased line and radioteletype networks arranged in point-to-point and / or multipoint configurations to support data processing applications for government and industry such as integrating the accounting, billing, management, production, purchasing, sales, shipping and receiving departments within an organization to speed internal communications.

Private line

private line
In wired telephony, a private line or tie line is a service that involves dedicated circuits, private switching arrangements, and/or predefined transmission paths, whether virtual or physical, which provide communications between specific locations. Most private lines connect only two locations though they may be switched at either end or both. Some have multiple drop points. Among subscribers to the public switched telephone network, the term private line is often used to describe an individual (one-party) telephone line, as opposed to a party line with multiple stations connected.

Java APIs for Integrated Networks

JAIN is part of a general trend to open up service creation in the telephony network so that, by analogy with the Internet, openness should result in a growing number of participants creating services, in turn creating more demand and better, more targeted services. A goal of the JAIN APIs is to abstract the underlying network, so that services can be developed independent of network technology, be it traditional PSTN or Next Generation Network.

Incahoot Ltd

Incahoot (a portmanteau derived from "in cahoots") is a UK-based group-buying website that negotiates deals on services such as mobile phones, broadband, energy and insurance. Incahoot launched in January 2011. Incahoot uses a large member base as a bargaining tool when negotiating offers with companies. It currently negotiates best value deals on mobile phones, home broadband, telephony, energy and insurance, as part of its mission to close the estimated 35% gap between prices offered to consumers and those negotiated by big businesses. Companies signed with Incahoot include Three, Plusnet, nPower and First:Utility.

Comparison of mobile phone standards

mobile phone standardscomparison of mobile phone standardsstandards
This is a comparison of standards of mobile phones. A new generation of cellular standards has appeared approximately every tenth year since 1G systems were introduced in 1979 and the early to mid-1980s. Global System for Mobile Communications (GSM, around 80–85% market share) and IS-95 (around 10–15% market share) were the two most prevalent 2G mobile communication technologies in 2007. In 3G, the most prevalent technology was UMTS with CDMA-2000 in close contention. All radio access technologies have to solve the same problems: to divide the finite RF spectrum among multiple users as efficiently as possible. GSM uses TDMA and FDMA for user and cell separation.

Telecommunications in Jersey

Jersey is incorporated into the UK National Telephone Numbering Plan, using the following area codes: * JT Global (formerly Jersey Telecom): * for land-lines * for mobiles * Sure (Batelco): * for mobiles * Airtel-Vodafone: * for mobiles Guernsey is incorporated into the UK National Telephone Numbering Plan, using the following area codes: * JT Global (formerly Wave): * for land-lines * for mobiles * Sure (Batelco): * for Mobiles * Airtel-Vodafone: * for mobiles. Fixed PSTN lines in use; approx 57,700 (2009). * JT Group Limited * Sure * Airtel-Vodafone Approx 108,000 active SIMs.

List of retronyms

Wireless telegraphy and wireless telephony were some of the first applications of radio technology, way back in the 1910s and 1920s; "wireless" as a noun today is sometimes simply a synonym for "mobile phone service"/"cell phone service". * 1994 Level : Before the Doom engine had more features added in source ports such as ZDoom and Doom Legacy, all levels for Doom made around 1994 had limitations that constrained the gaming atmosphere. But when more features were added to source ports for better level atmospheres, older-style levels started to be called "1994 levels" to differentiate from the newer kind.

Circuit Switched Data

CSDHSCSDcircuit-switched data
In communications, Circuit Switched Data (CSD) is the original form of data transmission developed for the time-division multiple access (TDMA)-based mobile phone systems like Global System for Mobile Communications (GSM). After 2010 many telecommunication carriers dropped support for CSD, and CSD has been superseded by GPRS and EDGE (E-GPRS). CSD uses a single radio time slot to deliver 9.6 kbit/s data transmission to the GSM network switching subsystem where it could be connected through the equivalent of a normal modem to the Public Switched Telephone Network (PSTN), allowing direct calls to any dial-up service.

Mobile phone signal

dropped calldroppeddead zones
These events may cause the user to be billed for "international" usage despite being in their own country, though mobile phone companies can program their billing systems to re-rate these as domestic usage when it occurs on a foreign cell site that is known to frequently cause such issues for their customers. The volume of network traffic can also cause calls to be blocked or dropped due to a disaster or other mass call event which overloads the number of available radio channels in an area, or the number of telephone circuits connecting to and from the general public switched telephone network.


From mobile phones to televisions, vast numbers of products include amplifiers for sound reproduction, radio transmission, and signal processing. The first discrete-transistor audio amplifiers barely supplied a few hundred milliwatts, but power and audio fidelity gradually increased as better transistors became available and amplifier architecture evolved. Modern transistor audio amplifiers of up to a few hundred watts are common and relatively inexpensive. Before transistors were developed, vacuum (electron) tubes (or in the UK "thermionic valves" or just "valves") were the main active components in electronic equipment.