# PMS Integration - Conditions

- You can use the Property Management System (PMS) application to check in and check out hotel room guests via the IP-based network port. The check in/check out feature for hotel room messages uses a Mitel proprietary protocol.

- You can use PMS to check in /out an embedded voice mailbox using either the HYATT or HIS protocol. PMS can communicate directly with MiVoice Business via port number 6830.

- You cannot use the 5540 IP Console to integrate with PMS. The 5540 IP Console does not have a printer port.

- In a Clustered Hospitality environment, the PMS connection must be to the Hospitality Gateway. When a PMS connection is attempted at a MiVoice Business system that is not the Hospitality Gateway, the attempt is ignored and no response is provided to the PMS. The Hospitality Gateway only supports a single PMS connection at a time.