Let us now focus on testing Voice over Internet Protocol (VoIP)-enabled services and see how we can check for various flaws that might affect VoIP services.
VoIP is a much less costly technology when compared to the traditional telephonic services. VoIP provides much more flexibility than traditional telephony in terms of telecommunication, and offers various features, such as multiple extensions, caller ID services, logging, the recording of each call made, and so on. Some companies now have their Private Branch exchange (PBX) on IP-enabled phones these days.
The traditional and still-present telephonic system is still vulnerable to interception through physical access, such 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 their device and can enjoy Internet and fax services.
However, in the case of VoIP services, we can compromise security...
