Security issiues in VOIP Applications

Such bandwidth is not always accessible and the redundant information will have to be processed, introducing even more latency to the system and ironically, possibly producing even greater packet loss. Newer codecs such as internet Low Bit-rate Codec (iLBC) are also being developed that offer roughly the voice quality and computational complexity of G.729A, while providing increased tolerance to packet loss. Better Scheduling Schemes   The incorporation of AES or some other speedy encryption algorithm could help temporarily alleviate the bottleneck, but this is not a scalable solution becauseit does not address the highest degree cause of the slowdown. Without a way for the crypto-engine to prioritize packets, the engine will still be susceptible to DoS attacks and starvation from data traffic impeding the time-urgent VOIP traffic. A few large packets can clog the queue long enough to make the VOIP packets over 150 ms late (sometimes called head-of-line blocking), effectively destroying the call. Ideally, the crypto-engine would implement QoS scheduling to favor the voice packets, but this is not a realistic scenario due to speed and compactness constraints on the crypto-engine.   One solution implemented in the latest routers is to schedule the packets with QoS in mind prior to the encryption phase. Although this heuristic solves the problem for all packet poised to enter the crypto engine at a given time, it does not address the problem of VOIP packets arriving at a crypto–engine queue that is already saturated with previously scheduled data packets.

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