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A VoIP phone or IP phone uses voice over IP technologies for placing and transmitting telephone calls over an IP network, such as the Internet. [1] This is in contrast to a standard phone which uses the traditional public switched telephone network (PSTN).
Bicom Systems began researching and creating telecoms management software in 2003. [4] An Asterisk pioneer, [5] Bicom Systems launched the first ever open standards turnkey telephony system in 2004.
Elastix 2.5 also supports other phone brands thanks to the SIP and IAX protocols that Asterisk implements. These protocols are based on public available standards. For this reason any manufacturer can build a product that supports them. Some certified manufacturers are Ascom, Snom and Yealink.
A SIP address is written in user@domain.tld format in a similar fashion to an email address.An address like: sip:1-999-123-4567@voip-provider.example.net. instructs a SIP client to use the NAPTR and SRV schemes to look up the SIP server associated with the DNS name voip-provider.example.net and connect to that server.
The FreePBX Distro supports a large number of phone models via open-source modules. [ 6 ] [ 7 ] Supported VoIP phone manufacturers include Aastra Technologies , Algo, AND, Audiocodes, Cisco Systems , Cyberdata, Digium , Grandstream, Mitel , Nortel / Avaya , Panasonic , Polycom , Sangoma , Snom , Xorcom and Yealink [ zh ] .
Operator assistance refers to service provided by a telephone operator to the calling party of a telephone call.This can include telephone calls made from pay phones, calls placed station-to-station, person-to-person, or collect, third-number calls, calls billed to credit cards, and certain international calls which cannot be dialed directly.
Interactive Connectivity Establishment (ICE) is a technique used in computer networking to find ways for two computers to talk to each other as directly as possible in peer-to-peer networking.
3CX, Inc., is a software development company and developer of the 3CX Phone System. The 3CX Phone System is a software private branch exchange based on the SIP (Session Initiation Protocol) standard to allow calls via the public switched telephone network (PSTN) or via Voice over Internet Protocol (VoIP) services.