VoIP – Voice over IP
Voice over IP (VoIP) is experiencing explosive growth. Many corporate environments have migrated, are actively migrating, or are researching the process of migrating to VoIP. Some long-distance providers are using VoIP to carry voice traffic, particularly on international calls. Companies, such as Vonage, offer VoIP service as a replacement for traditional telephony service in the home .
What is Voip & Internet Telephony
Internet Protocol(IP) telephony is a technology that uses packet-switched connections to exchange voice, fax and other forms of data that were previously carried on circuit – switched connections. using the internet, the packets of data are sent over shared lines.
Voice over IP ( Voip ) is voice information information delivered in digital forms as packets of data using internet Protocol instead of the traditional circuit – switched lines of the PSTN. VoIP is free for users if they already have Internet access, allowing them to avoid the tolls charged for using ordinary phone lines .
How It Works
VoIP uses IP technology. In a manner similar to how your computer uses TCP/IP to transfer packets with data, VoIP transmits packets with audio. Instead of the data protocols—such as HTTP, HTTPS, POP3/IMAP, and SMTP—used in the transfer of data packets, VoIP packets use voice protocols, such as SIP (Session Initiation Protocol), H.323, IAX (Inter-Asterisk eXchange protocol), and RTP (Real-time Transport Protocol). The header in the TCP/IP packet for data will be the same as for VoIP, including Ethernet frames, source IP address, destination IP address, MAC information, and sequence numbers.