I found that in India analog lines are all centrex lines and I am having trouble getting the centrex lines to work with the VIC2-4FXO card. I have a 1760v router with VIC2-4FXO and VIC-2FXO and for some reason the centrex lines can only work with the VIC-2FXO. I am not able to get them to work with the VIC2-4FXO. When I dial the number with the centrex lines connect to the VIC2-4FXO card, the call just keeps ringing and I am not seeing anything hitting the gateway. But it works fine with the VIC-2FXO card.
Yes, I did try different WIC and the result was the same, so we can safely say it is not the WIC. I have also tried different router as well, so we can also say it is not DSP. I don't know what else to try.
Please let me know if you can think of anything else !!!
Some FXS cards allow for you to input the idle-voltage with the idle-voltage [high] [low] command.
This may be a different in voltage support between the two cards. We've changed a number of the voltages for line/idle/ringing and such between card generations. I would check the datasheets I listed to see if this matches with something you're experiencing. Outside of the above idle-voltage command, the voltages are not configurable. It's worth getting a multimeter out and splitting the cables to see what you see. There are number of 3rd party inline ring-boosters, idle-boosters, and the likes for this purpose.
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