Various example embodiments are disclosed. According to an example embodiment, a non-transitory, computer-readable medium may include computer-executable instructions stored thereon. When executed by at least one processor, the instructions may be configured to cause a computing system to at least initialize a Voice over Internet Protocol (VoIP) telephone program in a guest mode configured to allow any user of the computing system to place telephone calls, and in response to a user logging in to the computing system, transition the VoIP telephone program from the guest mode to a custom mode for the logged-in user.