What Is Voip

Over View of Voip:

Voice over IP (VoIP, or Voice over Internet Protocol) usually refers to the communication protocols, technologies, methodologies, and transmission techniques involved in the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. Other terms usually connected with VoIP are IP telephony, Internet telephony, voice over broadband (VoBB), broadband telephony, IP communications, and broadband phone.

Services

Internet telephony refers to communications services —voice, fax, SMS, and  voice-messaging applications— that are transported via the Internet, rather than the public switched telephone network (PSTN). 

The steps involved in originating a VoIP telephone call are signaling and media channel setup, >digitization of the analog voice signal > encoding,>packetization, and transmission as Internet Protocol (IP) packets over a packet-switched network. 

On the receiving side, similar steps such as reception of the IP packets> decoding of the packets and digital-to-analog conversion replicate to the original voice stream.  

VoIP systems utilize session control protocols to control the set-up and tear-down of calls as well as audio codecs which encode speech allowing transmission over an IP network as digital audio via an audio stream.

VoIP is available on many smartphones and Internet devices so that users of portable devices that are not phones, may place calls or send SMS text messages over 3G or Wi-Fi.

Voip Network

How it’s work?

A way is required to turn analog phone signals into digital signals that can be sent over the Internet.
This function can either be included into the phone itself or in a separate box like an ATA .

VOIP using an IP Phone

IP Phone ----- Ethernet ----- Router ---- Internet ---- VOIP Service Provider

VOIP connecting directly:

It is also possible to bypass a VOIP Service Provider and directly connect to another VOIP user. However, if the VOIP devices are behind NAT routers, there may be problems with this approach.

IP Phone -----> Ethernet -----> Router ----> Internet ----> Router ----> Ethernet ----> IP Phone

Applications using VOIP

Traditional telephony applications, such as outbound call center applications and inbound IVR applications, normally can be run on VOIP.

Why use VOIP?

There are two major reasons to use VOIP

• Lower Cost
• Increased functionality

Lower Cost

In general phone service via VOIP costs less than equivalent service from traditional sources. This is largely a function of traditional phone services either being monopolies or government entities. There are also some cost savings due to using a single network to carry voice and data. This is especially true when users have existing under-utilized network capacity that they can use for VOIP without any additional costs.

In the most extreme case, users see VOIP phone calls (even international) as FREE. While there is a cost for their Internet service, using VOIP over this service may not involve any extra charges, so the users view the calls as free. There are a number of services that have sprung up to facilitate this type of "free" VOIP call. Examples are: Free World Dialup and Skype for a more complete list see: VOIP Service Providers

Increased Functionality

VOIP makes easy some things that are difficult to impossible with traditional phone networks.

• Incoming phone calls are automatically routed to your VOIP phone where ever you plug it into the network. Take your VOIP phone with you on a trip, and anywhere you connect it to the Internet, you can receive your incoming calls.
• Call center agents using VOIP phones can easily work from anywhere with a good Internet connection.

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