There you have it! With an inexpensive Raspberry Pi, a little coding knowledge and effort, Twilio’s excellent APIs, documentation and Quickstart code, you can make your own voicemail server. For that matter, you can do a number of other things related to voice or message communications as well!
Call voicemail from your own internal phone by pressing *99 (or the voicemail button). Dial in from another internal office phone with *98 and then enter your extension. Make a phone call to your extension from an outside line and press * when your voicemail greeting plays. Access your voice messages online from the GoToConnect user portal.

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Of course, we want to know as soon as an incoming voicemail is saved, so again, it’s Twilio to the rescue. By adding a few lines of code to our Python script, Stacey and I each get an SMS notification telling us there’s a new message. Note that Twilio’s API requires a separate call for each message to be sent, which is why the similar code repeats once for Stacey’s phone number and then again for mine. If you plan to send bulk messages from Twilio, I expect that you can build a list of phone numbers and loop through them with the API call. Since we only have two contact numbers and don’t expect to add any more, I decided not to loop through a list of two elements.