Clear-Com V12PDDXY - Manual (Page 153)

7.3.2 Headset connectors
The headset connector may be one of three types: XLR-4M, XLR-5F or XLR-7M.
The pinouts for each type are shown below.
Figure 183: XLR-4M headset connector
Pin Description / comments
1
Microphone Screen
2
Microphone Input
3
Headphone Return
4
Headphone Output
Table 39: XLR-4M headset connector pinout
153 V-Series Panels User Guide