The 3CX Hotel Module is an add-on for the 3CX Phone System that turns it into a fully featured Hotel PBX. It allows hotels to eliminate expensive lease payments and cut call costs while providing competitive guest call rates. The module features include check-in/out, Do Not Disturb settings, call blocking, wake-up calls, and billing calls to guest rooms upon check-out. It also supports interfaces with popular hotel software and allows reuse of existing analog phones to avoid rewiring costs.