In order to learn how to pentest VoIP, we need to have a clear understanding of how the VoIP infrastructure actually works. We are going to dissect VoIP protocols in order to learn later how to attack VoIP systems. The following subsections are some well-known standards that voice and video communications make possible. Let's explore them one by one.
VoIP fundamentals
H.323
H.323 is a data over IP standard introduced by the International Telecommunication Union Standardization Sector (ITU-T). As you can see, this standardization body uses letters to define the scope based on many criteria, listed here:
- H: For audiovisual and multimedia systems
- G: For transmission systems and media
- Q: For switching and signaling
- T: For...