ClearOne Converge Pro - Manual (Page 251)

Appendix B: Control/Status Port Default Pinouts 247
Converge Pro 840t: Port a (Female DB-25)
Pin # user Definable Control/Status Default Description
1 Y Control (input)
2 Y Status (output)
3 Y Control (input) Mute All Mics toggle
4 Y Status (output) Status of Mute All Mics
5 Y Control (input) telco on/off toggle
6 Y Status (output) Status of telco on/off
7 Y Control (input) Auto Answer toggle
8 Y Status (output) Status of Auto Answer
9 Y Control (input) Mute output 5 toggle
10 Y Status (output) Status of Mute output 5
11 Y Control (input) Mute input 5 toggle
12 Y Status (output) Status of Mute input 5
13 Y Control (input) Volume up output 8 (1 dB)
14 Y Status (output)
15 Y Control (input) Volume Down output 8 (1 dB)
16 Y Status (output)
17 n Status (output) Microphone 1 Gate Status
18 n Status (output) Microphone 2 Gate Status
19 n Status (output) Microphone 3 Gate Status
20 n Status (output) Microphone 4 Gate Status
21 Y Status (output)
22 Y Status (output)
23 Y Status (output)
24 Y Status (output) Ring indication
25 nA nA Ground