Zaplee has an internal system for voicemails so you don't have to purchase a skype voicemail subscription. When an employee is first added to the system, Zaplee will send out an email to the email on the employee profile (it sometimes ends up in the Spam folder). On it, there is a link allowing the employee to setup a customized greeting for their voicemail.
If you would prefer the admin to setup these greetings, you can go to the Greetings tab, and select Personal Greetings under the General Greetings drop down list. Once Personal Greetings are selected, another drop down appears under the General Greetings tab that will contain all employee names. Select the one you would like to create greetings for and then use the standard greeting options (Record Now, Upload File, or Computer Generated Text to Speech) to create the employees custom voicemail greeting.