Polycom SoundStructure C16 Design Manual page 591

PSTN Line Voltage—pstn_line_voltage
Argument Argument value
Channel Type Virtual Channel
Value Type Integer
Read/Write Mode Read-Only
Phys Chans Analog Telephony Output
Virt Chans Mono
System Limits Minimum: -128, Maximum: 128
Event Source No
Description
This parameter indicates the line voltage (in Volts) of the PSTN interface. The value is valid in both
on-hook and off-hook modes. The value can be positive or negative, indicating the polarity of the tip/ring
voltage. When the value changes sign, it indicates that a polarity reversal has occurred.
Examples
Command
get pstn_line_voltage
"Phone Out"
Polycom, Inc.
Response
val pstn_line_voltage
"Phone Out" 0
Description
Queries the pstn_line_voltage and returns the measured
value in Volts on the phone line "Phone Out". Note that
the phone out virtual channel name must be used, not the
phone in virtual channel name.
591