Testing VOIP services

Now, let's focus on testing VOIP-enabled services and see how we can check for various flaws that might affect VOIP services.

VOIP fundamentals

Voice Over Internet Protocol (VOIP) is a much less costly technology when compared to traditional telephonic services. VOIP provides much more flexibility than the traditional ones regarding telecommunication and offers various features, such as multiple extensions, caller ID services, logging, recording of each call made, and so on. Multiple companies have launched their Private Branch Exchange (PBX) on IP-enabled phones.

The traditional and the present telephonic systems are still vulnerable to interception through physical access, so if an attacker alters the connection...