I am managing a vacation rental website with 15 apartments. We need to assign each apartment one phone number (a different US phone number for each apartment.) from Twilio with international messaging capabilities. We will need to send and receive SMS messages from international locations such as France, Germany, Spain, Italy, etc, between each phone number and different people worldwide inquiring about the apartments. We need a platform on which to manage the SMS chats of each phone number all in one place.