Hello, you have reached X (service provider). Unfortunately, all our agents are engaged in talking to other customers. You can stay online or to resolve something urgent, try our live chat service. You also have the option of leaving your name, ID and number and our agents will revert to you at the earliest.
We recommend including your name and a short message, especially if you use this phone for business purposes.

If a phone rings once and then goes to voicemail or rings only briefly, it usually means either that your call is blocked or that the phone is not receiving calls at all. If the phone rings five times and then voicemail picks up, it's more likely that the person on the other end simply isn't picking up the call.
Voicemails have been around in one form or another since the beginning telephone communications. This feature still manages to make its way on every smartphone, despite the rate in which technology is evolving. The reason for this is usefulness – you won’t miss any unanswered calls even if your phone is off. The voice messages from your callers will be transferred to your voicemail box and you’ll be able to listen to them at a later date.