ClearOne Converge Pro - Manual (Page 341)

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Converge Pro VH20: Port A (Female DB-25)
Pin # User Definable Control/Status Default Description
1 Y Control (Input) Telco On
2 Y Status (Output) Telco On Indicator
3 Y Control (Input) Telco Off
4 Y Status (Output) Telco off indicator
5 Y Control (Input)
6 Y Status (Output)
7 Y Control (Input)
8 Y Status (Output)
9 Y Control (Input) Transmit Mute
10 Y Status (Output) Transmit Mute status
11 Y Control (Input) Receive Mute
12 Y Status (Output) Receive mute status
13 Y Control (Input)
14 Y Status (Output)
15 Y Control (Input)
16 Y Status (Output)
17 Y Status (Output)
18 Y Status (Output)
19 Y Status (Output)
20 Y Status (Output)
21 Y Status (Output)
22 Y Status (Output)
23 Y Status (Output)
24 Y Status (Output) Ring Indication
25 NA NA Ground