Calendar Server 5.1.1
cis, multi-valued
The list of all possible back end hosts used for calendars found in this domain. This attribute is required if the calendar installation is using the Database Wire Protocol (DWP).
icsDWPBackEndHosts: machine1
icsDWPBackEndHosts: machine2
1.3.6.1.4.1.42.2.27.9.1.5