Automatic call answering and routing protocols allow you to customize the rules of your phone network from any device that has access to the internet.
This is especially useful if you expect important family calls at work. You can prioritize those calls in the system and designate them to be forwarded directly to your cellphone from the company phone, and even direct other incoming calls on that phone back to the office system or straight to voicemail.
This works for any phone of your choosing. You can even specify which protocols are active on which days and times in order to create unique answering and routing rules for different departments or events. You can customize the outgoing greetings and schedule routing for different employee or departmental configurations.