My vote is for RMA time. This low voltage will cause device issues as you have seen. Here is a Cisco doc that indicates what the "idle line voltage" should be. Have a look;
Ringing and Idle Voltages on Cisco FXS Interfaces
Idle Battery Voltage
Cisco voice gateways were designed for ONS connections and by default the FXS interface supplies either -24Vdc or -36dvc idle battery, whereas Off Premise Services (OPS), such as a CO, would require voltages of -48v because it may have to interconnect over much greater cable lengths.
VG224 should supply -24 Volts (low) -48 Volts (high)
Our unconfigured ports show -18 to -19VDC but once they are configured as a POTS port they went to -38VDC. (We are running 12.4(13A) Mainline.
If you apply the alt-battery-feed feed2 to the voice-port you will get about -43VDC, however, TAC told us that they can not get -48VDC due to a hardware/firmware limitation. They are in the process of revising the docs on CCO.
We are experiencing an issue with multiple VG224s when attempting to raise the voltage level. Every port / gateway is working properly before applying this command. After issuing the following cmd all ports on the analog block enter a fast busy state (lockout). Any suggestions?
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