An IP phone is a new technology of this century. An IP phone, a phone that sends the traffic over a TCP / IP. An IP phone uses the technology of Voice over IP allows telephone calls over an IP network like the Internet instead of the ordinary PSTN system. Calls can be made on the Internet or private IP network to browse, like a business. The phones used to control protocols such as Session Initiation Protocol, Skinny Client Control Protocol or one of various proprietary protocols, as used by Skype. IP phones can be simple software-based Softphones or custom-designed hardware devices, which seem very much like a standard phone or cordless phone. It is also possible to reuse ordinary PSTN phones such as IP phones with analog telephony adapters (ATA). Satellite Phone – Connecting People, Anytime Anywhere
IP phones are typically used for VoIP applications. An IP phone has many features of an analog phone does not support, such as e-mail type IDs for contacts that may be easier to remember than names or phone numbers.
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Common features of IP phones
* Caller ID * Dial by name / ID: This is by dial-up call from your mobile phone registers that the user does not need a phone number, the SIP register differently.
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* Stored in local and network-based directories * Meeting multiparty call * Call Park and Call waiting * Call forwarding * Maintain user name / number in the selection of another service provider (not widely supported). * Applications such as weather, school and offices, online news, etc.

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