Sony CCU Connections  - Intercom

Connecting Intercom to Sony CCUs
4 - Wire connection
2 - Wire connection
(Click to Enlarge)
(Click to Enlarge)
See photos above for pinouts for both the default 4-wire intercom connections as well as the optional 2-wire configuration. See also: https://clear-com.atlassian.net/wiki/spaces/SF/pages/256573574/Sony+CCU+Solutions