Checking telco line status

Unanswered Question
Feb 7th, 2007

Simple question....

What command do we issue to check the status of telco lines on the router with FXO ports?

To determine if the pstn lines are out of service.


I have this problem too.
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gracianogardunojr Wed, 02/07/2007 - 20:13

FXO you will need to hang a butt set on the lines, If loop start you go off hook you should get dial tone. If ground start you will need to place a ground on one side the pair with your butt set off hook you should get dial tone. On the voiceport make sure you are setup with the correct signaling ie:

loopstart groundstart.

Hope this helps


jechoi Thu, 02/08/2007 - 04:51

Hi JR,

We are using loopstart.

Just mean to say that there is no command to remotely check to see if there is line problem on telco side quickly?


jechoi Sat, 02/10/2007 - 05:45

I see. That is why i can't find any while searching.

I was hoping cisco has some command for this to make life easier. This is one of the comparison made by our customer with avaya pbx.


Paolo Bevilacqua Sat, 02/10/2007 - 06:03

Yes there are test commands. Try "csim start " to originate a call. Also read the this thread

at the bottom some special test command that will let you detect presence of loop current on FXO lines.

My advice in genreral would to not use analog lines, only BRI, that is easy to diagnose, and give the best in terms of speed, quality and features.


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