Very likely you don't have the necessary DSP module (minimum of PVDM2-8).
You cannot use the FXO ports without these.
You check what you have with "show diag".
I have cisco 2811. PVDM is showing in inventory but VIC2-4FXO isn't however it's showing amber LED.
Any work around to use module because I've tried many routers but it's same behavior.
One of two problems:
If you do a 'show diag | i FRU' you should see PVDM2-X of some sort.
If there is, then you are either on ip base, enterprise base, or the security base feature set, and do not have the voice feature set in your IOS and need to upgrade your IOS feature set.
Hello Thank you for attending to my question
I do show diag | i FRU look
yourname#show diag | i FRU
Product (FRU) Number : CISCO2811
Product (FRU) Number : VIC2-4FXO
Product (FRU) Number : NME-CUE
I do not have what they say to me.
Yep, no DSPs. PVMD2-8,16,32,64 are the options.
They look like little RAM sticks you put into your router that make your router voice capable for analog ports.
You can use this tool to determine exactly how many you need: