Context does matter here. If the caller would reasonably expect you to answer the phone (such as if they were calling a store or other place of business), an apology for not being able to get to the phone makes the most sense.
The combination of a professional message and a robust phone system with advanced voicemail capabilities can help you set your business apart. Voicemail Greeting Outline. All professional voicemail messages should have the following elements included.

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“Hello ___. This is ______ from _________. I’m calling because you requested information through [vendor] about [address of house]. I’m available right now to answer questions. I found a couple of other homes near the one you’re interested in, and they are similarly priced. Do you want to talk tonight? You can call or text me at ___________. I look forward to speaking with you and answering any questions. Again my number is ___________. Thank you!"