Re: Do I have to use 2 wires/pins Rj11 cable to interconnect FXS
Well the ports themselves only look at a single pair, so tip and ring (2 wires total) is all that the port will look at. Though it is wise to not use 4-conductor wiring anywhere, since you can potentially get analog crosstalk when doing that.
You don't have a concept of a link light on an analog circuit. There is not a pulse to test for a link connection on the other side with FXS/FXO.
Just use a cable that is straight through (tip-to-tip, ring-to-ring) and you should be good. Crosses cables (tip-to-ring) will not work. Then place a test call across the circuit, and use 'debug vpm sig' or 'sh voice call sum' to see what the state of the port on the other side goes to.
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