Use an “Office” system to connect remote teams or multiple offices. Use a “Professional” system to forward calls to other phones. Learn more about how you can find the right Virtual Phone System
You will be relying on internet connections that can, and will go down. If this makes you uncomfortable, have a backup
Many features are standard, but others may be upgrades, or some providers may not even provide them. Know which features you must have.
Most providers will offer an extensive list of available phones that come plug and ring ready, while others offer only a few, and some will require you to purchase them elsewhere.