Testing VOIP services

Let's now 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 the traditional telephonic services. VOIP provides much more flexibility than the traditional ones in terms of telecommunication and offers various features, such as multiple extensions, caller ID services, logging, recording of each call made, and so on. Various 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 that if an attacker alters the connection of a phone line and attaches their transmitter, they will be able to make and receive calls to the victim's device and enjoy Internet and fax services.

However, in the case of VOIP services, we can compromise security without going on to the wires. Nevertheless...