Security issiues in VOIP Applications
One consideration with this method is that the endpoints must be computationally powerful enough to handle the encryption mechanism. But typically endpoints are less powerful than gateways, which can leverage hardware acceleration across multiple clients. Though ideally encryption should be maintained at every hop in a VOIP packet’s lifetime, this may not be feasible with simple IP phones with little in the way of software or computational power. In such cases, it may be preferable for the data be encrypted between the endpoint and the router (or vice versa) but unencrypted traffic on the LAN is slightly less damaging than unencrypted traffic across the Internet. Fortunately, the increased processing power of newer phones is making endpoint encryption less of an issue. In addition, SRTP and MIKEY are future protocols for media encryption and key management enabling secure interworking between H.323 and SIP based clients. Secure Real Time Protocol (SRTP) Jitter: refers to non-uniform packet delays. Jitter can cause packets to arrive and be processed out of sequence. RTP, the protocol used to transport voice media, is based on UDP so packets out of order are not reassembled at the protocol level. However, RTP allows applications to do the reordering using the sequence number and timestamp fields. The overhead in reassembling these packets is non-trivial, especially when dealing with the tight time constraints of VOIP. RTP (Real-time Transport Protocol) is commonly used for the transmission of real-time audio/video data in Internet telephony applications.Pages: 1 2 3 4 5 6 7 8 [9] 10 11 12 13 14
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