test voice port 0/0/0 si-reg-read 29 1
// in the above command we are testing FXO voice port 0/0/0
if the output of the above command (make sure you enable "terminal monitor" if you are accessing the router via telenet and not console) is anything other than "0x00" you do have voltage but if you receive a "0x00" then that line is dead .... either make sure the line is properly terminated to the FXO port or call up the PSTN to check it out..
// in the above command we are testing FXO voice port 0/0/0
if the output of the above command (make sure you enable "terminal monitor" if you are accessing the router via telenet and not console) is anything other than "0x00" you do have voltage but if you receive a "0x00" then that line is dead .... either make sure the line is properly terminated to the FXO port or call up the PSTN to check it out..
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