What is the default length of the Voicemail PIN for an extension in 3CX?

The default length of the Voicemail PIN for an extension in 3CX is indeed 4 random alphanumerical characters. This length is designed to provide a balance between security and usability. A 4-character PIN is generally easy for users to remember while still maintaining some level of security to protect their voicemail messages.

Choosing a length that is too short could increase the risk of unauthorized access, while a length that is too long might make it cumbersome for users to enter their PIN frequently. Hence, a 4-character length is a practical compromise used by 3CX to ensure that users can securely access their voicemail without excessive difficulty.