Which type of attack occurs when an attacker is successful in eavesdropping on a conversation...

 A man-in-the-middle attack occurs when a third party intercepts and potentially alters the communication between two parties (in this case, two IP phones) without them knowing. This type of attack can lead to eavesdropping, where the attacker can gain unauthorized access to sensitive data being communicated between the two parties. References := Cisco Cybersecurity Operations Fundamentals - Module 5: Endpoint Threat Analysis and Computer Forensics