A Preamble              
                     “Architecture” is a high-level design of interconnected system, which addresses the business requirements. If we distinctively talk about the “computer network” then, architecture determines the standards of the hardware, software along with the interconnected devices.
There can be many architectures build for the business purpose for instance-
      The Public Switches Telecommunication Network (PSTN)
                       A “Centralized architecture”, where the exchange handles all the decision making process. The switches control the dumb terminals serving as the end -points of the network. The PSTN serves best in the call control with a centralized management.
      The VoIP Architecture
                       The architecture of VoIP implements one of the two models –
- Centralized Architecture
- Distributed Architecture or Peer-to-Peer Architecture
                    The Centralized Architecture operates in the master slave mode. The “media gateway controller” or the call agent is the master device in the architecture, and takes care of the switching logic and controls the call.
 To get a clearer picture of how the centralized architecture works, let us view the core framework of the architecture.
                 To start with, let us first take “The Application Service Provider”, it delivers the VoIP traffic to the destination network; presume the “SIP network” via the internet. However, the data packets move out to the internet through the “Session Border Controller”. Further, “IP Routers” make sure, that the packets reach the destination efficiently. As we move further comes the “Session Initiate Protocol Network”, connects itself to the public internet and receives data traffic o VOIP Solution that originated from the “Application Service Provider” in the beginning. At this point of time, transformation of “packet information” into “voice stream” completes. From here, the message comes into human audible form, which the end-users of SIP network can make use of. The complete above process happens in case of “Public Switches Telephone Network” once again, only the “SBC” replaces the “Media Controller”.
In case of the Enterprise users, they all are linked with the internet through the “Broadband Network”, that is responsible for the complete transmission of data from source to destination.
Next, we shall consider the “Distributed Network” alleged as Peer-to-Peer Network .
                The Distributed Networks have very different architecture than the “Centralized Network”. In this network all, the end-points are intelligent terminals that work independently with powers to initiate as well as terminate the calls as required.
                  The Distributed structure has number of the “TDM” with the “VoIP Service Provider” interconnected to each other. In “distributed network” two networks are not connected directly to each other, this is the reason why the data packets need to pass through the end-points coming between the source and destination. Any of the networks, May it be “mobile”, “VoIP” or the “PSTN” network can be used to connect the end-users of the network.
                 If we differentiate between the “distributed” and “centralized” architectures, then we come to know that although the “centralized” structure involves less investment than “distributed” but “distributed” provides better services allowing VoIP to behave as an independent application.
                 This discussion must have cleared the concept of the architectures used in VoIP. Further, helping you to decide which would be more suitable for your business environment. Then what are you waiting for? Just go and seize one of them for yourself soon.

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