The pet care service providers get calls from pet owners at odd hours or when they are busy attending to their chores. So, resorting to voicemail services is necessary for such businesses. Below is an excerpt from a voicemail for a pet service entity:
I’d bet good money that most voicemails never get played. Instead, they just sit there serving as extra “missed call” notifications, letting you know to call or text back whoever bothered to leave you the message in the first place.

If a phone rings once and then goes to voicemail or rings only briefly, it You can't definitively know the cause of a phone barely ringing and going to voicemail because neither a phone company nor the phone's operating system provider will tell you if your phone number is blocked.
On the app, click on the "Sound" icon at the lower left part of the tool and select "Microphone." Then, open your voicemail service on your phone and play the voice message. The online audio recorder then clicks the "Record" button on the audio recorder while the voicemail is playing. If you are recording using an external mic, make sure that your phone is on the loudspeaker and pointed at the mic.