If you want a more advanced version of the Online Audio Recorder, use AceThinker Music Recorder. Also, it is available to install for both Windows and Mac computers. The primary advantage of this software to others is its fantastic "Task Schedule" function. Using this, you can set a time and date and let the software automatically record the voicemail while you're away from your device. Follow the brief instructions provided to learn how to use this tool.
The bottom line is that a business’s situation is likely to change often and rapidly, each of which need a unique and applicable voicemail greeting to cover the circumstances and timeline. For example, callers shouldn’t reach a business-as-usual voicemail, and therefore expect a return call within the business day, if the subject they’re calling is out on vacation for two weeks. Such a lack of communication is a recipe to lose that caller’s trust and tarnish the brand’s reputation.

Forget about messing around with apps. There’s a powerful voicemail handling system built into nearly every big carrier today — and that system almost always includes a system for recording a voice message and sending it directly without ringing the target phone. I will walk you through the process of doing this on Straight Talk (since that happens to be my carrier) but most carriers will have similar systems.
Some of the solutions to this error include setting up voicemail and resetting the network settings.