Security issiues in VOIP Applications
QoS prioritizing can also be done after the encryption process provided your encryption procedures preserve the ToS bits from the original IP header in the new IPsec header. This functionality is not guaranteed and is dependent on one’s network hardware and software, but if it is implemented it allows for QoS scheduling to be used at every hop the encrypted packets encounter. There are security concerns any time information on the contents of a packet is left in the clear, including this ToS-forwarding scheme, but with the sending and receiving addresses concealed, this is not as egregious as a cursory glance would make it seem. Still neither the pre-encryption or post-encryption schemes actually implement QoS or any other prioritizing scheme to enhance the crypto-engine’s FIFO scheduler. Speed and compactness constraints on this device may not allow such algorithms to be applied for some time. CONCLUSION This paper has discussed on VOIP architecture, security issues & security mechanisms followed in the VOIP architecture. The generic problems & the solution for the VOIP system are discussed. Future work may include software attacks prevention through solid security policies and their enforcement. REFERENCES 1.W.C. Hardy, QoS Measurement and Evaluation of Telecommunications Quality of Service, John Wiley & Sons, 2001. 2.W.C. Hardy, VOIP Service Quality: Measuring and Evaluating Packet-Switched Voice, McGraw-Hill, 2003. 3.International Telecommunications Union. ITU-T Recommendation G.114 (1998): "Delay".Pages: 1 2 3 4 5 6 7 8 9 10 11 [12] 13 14
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