Is there a way on a VIC FXO to find out if there is an actual line plugged in to it?
I know on a Linksys Gateway SPA400 the minute you plug the line in, the voltage indicator will change; which indicates that it's actually plugged into something. Is there a similar info on a Cisco FXO or something similar?
On the ISR router with a FXO port you can also use a command to verify voltage for the voice port. There is a Cisco document that details the command used below, it will report if there is any voltage on the fxo port in question. I used this command to remotely troubleshoot an outage report for an overhead paging system. The paging system is providing the voltage/battery. If this was a CO type line, then, again the PSTN is providing the battery, so if it is connected to the fxo, you must have voltage.
> term mon
> test voice port port# si-reg-read 29 1
> A value of 0x00 indicates there is no voltage being seen on the line/voice port.
> You need the terminal monitor command to see the output of this command on the screen.
homegw-220#test voice port 3/0/2 si-reg-read ?
<0-200> Starting register in decimal: 0 - 200
homegw-220#test voice port 3/0/2 si-reg-read 29 ?
<1-6> Number of registers to be Read: 1 - 6
homegw-220#test voice port 3/0/2 si-reg-read 29 1
Jun 18 2009 16:44:53.629 EDT:
Values read from SiLabs Codec connected to DSP 0, channel 2:
Although relatively simple I use a "show voice port summary" and then call into the FXO line. You will see the port chaning status to ring-detected, if the status show no change, then there's nothing connected.
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