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Hacking VoIP by Himanshu Dwivedi

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Chapter 3. SIGNALING: H.323 SECURITY

H.323, an International Telecommunication Union–Telecommunication Standardization Sector (ITU-T) standard, is a very common signal protocol used on VoIP networks. As a signaling protocol, it is used for registration, authentication, and establishing endpoints on the network. Similar to SIP, H.323 handles signaling and relies on RTP for media transfer (discussed in Chapter 4). However, H.323 is a system specification comprising several other ITU-T protocols, including H.225 (manages registration, admission, and status), H.245 (the control protocol), H.450 (offers supplementary services), H.235 (provides security services for both signaling and media channels), H.239 (offers dual streaming), and H.460 (allows ...

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