Can the stand alone system be deployed in high availability for redundancy purposes?
Yes, using the Xorcom TwinStar option you can get redundancy for the PBX and telephony interfaces. The PMS interface integrates into the PBX, so if the failure stems from the PBX, the PMS interface (which operates from a Windows PC) will failover to the backup PBX server. A separate redundancy option needs to be implemented for the PC housing the PMS interface to remove that as a single point of failure.