I have read a lot of papers about VoIP security issues. The main focus is on SIP protocol. You can find hundred of papers about securing SIP. Even though other signaling protocols like H.323 and IAX or even media protocols like Real-time Transport Protocol (RTP) have security problems that have been described in enter link description here, there is almost no paper about them. I want to start a beneficial work on VoIP security and I am confused about this.

  • What do you mean by 'work on VoIP security' ? you have to mention many things including the application and the standards of your aiming of using VoIP. – Emadeddin Sep 29 '15 at 20:18
  • I mean academic and experimental study. – Hanna Sep 29 '15 at 20:26

It basically depends on signaling protocol, since it controls encryptions and so on.
For example, H.323 supports the using of SRTP, TLS, or even IPsec via its H.235 standard. While SIP uses other methods.

So I think before you start working on security of VoIP, you should go through a comparison between signaling protocols. Although I advise of using SIP for your researches.

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  • My question is why almost all researches are on SIP and it seems nobody is interested in other protocols like h.323 and IAX? – Hanna Sep 30 '15 at 8:08
  • Maybe it's because SIP is a slightly modern that others protocols, or maybe SIP is growing in popularity due to its use of and similarity to Internet technologies such as HTTP. – Emadeddin Sep 30 '15 at 8:26

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