The security of phone systems has often remained a separate subject. Now, the risks associated with telephone systems can have serious consequences on the information system and businesses. Moreover, the list of historical flaws of telephony is still relevant now that it uses IP standards.
VoIPshield Laboratories, a company specializing in the security of VoIP systems in November 2008 discovered a security flaw in the protocol RTP1. The flaw in question was not presented in detail but the lab announced that it would conduct denial of service attacks on software users using RTP.
With the commoditization of broadband networks, the number of applications has increased dramatically. The applications of VoIP (Voice over IP) is one of the new opportunities. The increase in flows and permanent connections provide opportunities for development of voice over IP (Internet Protocol).
The development of VoIP has led designers to develop API (Application Programming Interface) specific to VoIP. The integration of new requirements in a platform development helps attract software developers who need to integrate functions of VoIP into their applications. They implement the SIP protocol.
VoIP APIs can be used in many applications, the simplest being soft phones. Other applications can integrate VoIP as a secondary need. For example, instant messaging applications that integrate increasingly able to speak directly with contacts or any application requiring a textual interaction between different client applications such as video games.