6 Securing VoIP in SIP Mobile Network

Abstract- Lately, the development and progress have become significant in the field of information technology, especially in the field of data transmission via internet. One kind of the data transfer is voice. This part of the development in the field of mobile devices, which is possibility supplying the device by internet service.These developments in the field of technology are concurring many problems, where it had a direct impact on this development and the turnout by the users. In this paper, the model’s implementation has done on a mobile device (Which is operating by (Android) system). The sound transfer process has been via the internet using the SIP server to authenticate and reliability the communication process between two parties, after that RSA algorithm (key size used 1024 bit) is using of increased the encryption keys strength and exchanged between the two parties and to ensure that the packet transmitted every time. (AES) algorithm used to encrypt the package, choosing this algorithm that is very effective, which is associated with the encryption speed. Key size used in the model with AES is (256 bit) to ensure the secured and speed of the proposed operation