Idle voltage command on ISR 4331

[divkumar]

How to set the idle-voltage to low or high for FXS port  in ISR 4331?

the idle-voltage {low|high} under the voice-port does not work.

[HARIS_HUSSAIN]

That command is not supported with VIC Cards

https://www.cisco.com/c/en/us/support/docs/voice/analog-signaling-e-m-did-fxs-fxo/28280-ring-idle-voltages-fxs.html

Resolving Answering and Call Initiation Problems with Automated Telephony Devices
Configure this command on the voice port of the FXS to increase idle battery voltage from -24 volts to -48 volts:

Router(config-voiceport)#idle-voltage {low | high}
Note: This option is not available on the VG248, VIC-2FXS, and WS-x6624 FXS interfaces.

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Thanks,
Haris

[Jaime Valencia]

This is a public forum, please use internal resources for this kind of questions.