To begin with the recording, download Streaming Audio Recorder and install the program, when it is ready just open it.Before playing your voicemail, you need click On button first. Then Streaming Audio Recorder will start to record the voicemail that playing in your computer when it detects the sounds.Now go to your VoIP provider and phone in your voicemail number. Once you get access to your voicemail, you can now play them as you want depending on your preference.
9. Update Your Greeting Frequently. Many of the things that can make your voicemail great, also require that you update it pretty regularly. Information like deals you’re running, when you’re away, and who to contact while you’re out can take your greeting to the next level, but they’re obviously time sensitive.

You can also upload an unavailable greeting using the OnSIP app. After logging in, click on the Voicemail Settings gear icon at the far right. Make sure that the Custom Greeting is toggled to "on." You will then see an option to upload a .wav file of your choice. This recording will serve as your unavailable message.
If you’re contacting the same people with marketing voicemails and emails, you shouldn’t repeat information verbatim. By mixing up your approach, you make it more likely to get a response to at least one method. Also, your voicemails should be more personalized than your emails. For example, you could send an email to a contact – and 500 others – asking for feedback about a specific product they recently bought.