In a scenario with a VoIP switch that does not hang up after a call, what is the most likely issue?

The most likely issue in a scenario where a VoIP switch does not hang up after a call is indeed a configuration problem. Most VoIP systems rely on specific settings and protocols to manage call initiation and termination properly. If these configurations are incorrect or not properly set, the system may fail to send the appropriate signals to disconnect the call when it ends.

Common configuration issues can include incorrect SIP (Session Initiation Protocol) settings, missing or incorrect timer settings for call duration, or issues with the dial plan that dictate how calls are established and terminated. Addressing this configuration issue would typically involve checking the system settings and potentially updating or correcting any erroneous entries.

In contrast, the other options focus on aspects like hardware compatibility, cabling integrity, or power supply issues, which, while important, are less directly related to the VoIP switch’s inability to hang up a call in this specific context. A configuration problem is more likely to result in improper call termination behaviors, making it the most relevant answer to this scenario.