There is no clear-cut method of creating voicemails messages with a 100% success rate because different markets need different strategies. But a well-crafted message can help grasp those leads that are likely to close a deal with your businesses.
Before you even begin to draft and implement business voicemail greetings, your pain points need to be identified. For example, if you’re upset that clients aren’t leaving enough context on a voicemail, make sure you’re clearly stating what needs to be in the voicemail. If your clients are unfamiliar with how your business operates and keeps calling during off-hours, identify what time is best to call and say you’ll respond to messages first thing in the morning.

28. Hello, you’ve reached [your name]. I can’t come to the phone right now, probably because I’ve just stepped away from my desk, but possibly because I’m trapped under something heavy. Leave a message and I’ll call you back within one business day — and if I don’t, please send help.
The Session Initiation Protocol (SIP) is one of the underlying technologies that make VoIP possible. This is a text-based protocol similar to HTML. It's the most commonly used standard for setting up and controlling phone calls in most VoIP systems. You'll run across references to SIP in almost anything you do with these kinds of phone systems, especially when you're selecting any handset hardware you want to use.