It can facilitate tasks and provide services that may be more difficult to implement or more expensive using the Public Switch Telephone Network(PSTN).It can also transmit more then 1 telephone call on the same broadband connection.it can be possible to add an extra telephone line for a home or office use.
Conference calling, call forwarding, automatic redial, and caller ID; zero- or near-zero-cost features that traditional telecommunication companies (telcos) normally will charge more.
Secure calls using standardized protocols (such as Secure Real-time Transport Protocol.) Most of the difficulties of creating a secure phone connection over traditional phone lines, like digitizing and digital transmission, are already in place with VoIP. It is only necessary to encrypt and authenticate the existing data stream.
Location independence. VoIP provider need to get connected to Internet,where only Internet is needed. For instance, call center agents using VoIP phones can work from anywhere with a sufficiently fast and stable Internet connection.
Integration with other services available over the Internet, including video conversation, message or data file exchange in parallel with the conversation, audio conferencing, managing address books, and passing information about whether others (e.g. friends or colleagues) are available to interested parties.
Reference From:
http://pri-bryanixcommunications.tech.officelive.com/voipfunction.aspx
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