LodgingLink by Comtrol is a device meant to connect multiple different hospitality systems together, with a common integration language. LodgingLink allows multiple hotel systems such as phone, video rental, POS systems, and many others to post charges to guest rooms when there is no direct integration available. Book4Time uses LodgingLink's Comtrol system to post charges to guest folios when there is no direct integration, and the hotel system supports LodgingLink.