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Security issiues in VOIP Applications

Without protection RTP is considered insecure, as a telephone conversation over IP can easily be eavesdropped. Additionally, manipulation and replay of RTP data could lead to poor voice quality due to jamming of the audio/video stream. Modified RTCP (Real-time Transport Control Protocol) data could even lead to an unauthorized change of negotiated quality of service and disrupt the processing of the RTP stream.   The Secure Real-time Protocol is a profile of the Real-time Transport Protocol (RTP) offering not only confidentiality, but also message authentication, and replay protection for the RTP traffic as well as RTCP (Real-time Transport Control Protocol). SRTP was being standardized at the IETF in the AVT working group. It was released as RFC 3711 in March 2004. SRTP provides a framework for encryption and message authentication of RTP and RTCP streams. SRTP can achieve high throughput and low packet expansion.  Packet Loss   VOIP is exceptionally intolerant of packet loss. Packet loss can result from excess latency, where a group of packets arrives late and must be discarded in favor of newer ones. It can also be the result of jitter, that is, when a packet arrives after its surrounding packets have been flushed from the buffer, making the received packet useless. Despite the infeasibility of using a guaranteed delivery protocol such as TCP, there are some remedies for the packet loss problem.   One cannot guarantee all packets are delivered, but if bandwidth is available, sending redundant information can probabilistically annul the chance of loss.

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