• voip advantage 1, the cost is cheaper for the used of the direct connection in the far range. The differentiation of VoIP between the other communication devices is that cheaper cost. With the both location that connect to the internet connection, the conversation would be easier.

•voip advantage 2, using the Free infrastructure connection or network that already existed for the devices of deliver a sound or voices. It would be useful if the company already have the Internet connection because it would be possible to build the VoIP connection easily. The company does not need the monthly extra cost for the added of the voice communication.

•voip advantage 3, the used of bandwidth which is smaller than the regular Phone. The development of technology, the uses of Bandwidth is become very small. The technique of depreciation of data makes the voice would be possible used only 8kbps of bandwidth.

•voip advantage 4, possible to be collaborated with the existed local telephone in your place. With the availability of the gateway, the form of VoIP could be collaborated with PABX. The communication Calls in the office would be able to be done with the regular Phone.

•voip advantage 5, there are plenty of the VoIP connections that able to be collaborated to be a bigger connection.

•voip advantage 6, the variation of the existed devices, tool or application. For example the Cellity application.

VoIP phones of Skype use the HTTP protocol to communicate with the Skype server for the authenticated of the username or the password and registries with the Skype server. The modify version from the HTTP protocol used for communicated with the other users of Skype Client. The advantages that own by this application are the availability of the free security network during the data transmitted which appear in the form of sound.

There is two type of service that given by the Skype or voip phones. The first offer is privacy which using the AES and the second is the Authentication that would be recognized by the registered username and password.