For any telephone/cellular service provider who cares, you should be implementing the option of caller-specific voicemail greetings on your system. The scenario happens quite often: I know somebody specific is going to call me during a period in which I'll be unavailable, and I have a specific message just for them, e.g. "I'm mowing the lawn but I'll be ready when you get here" or something like that. Also, having a web page to administer the whole voicemail system and contacts would be great. Feel free to pay me for the preceding advice.
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