I've noticed when there is no PSTN line terminated on FXO, still the dial-peer Operational status is shown as "UP". I've VIC2-4FXO where PSTN is terminated on two ports only. The dial-peers are configured for all 4 ports.
It is causing outbound calls hiting such dial-peer randomly and then falling-back to others. By the time call-reaches the working dial-peer, it seems the "timeout wait-release 3" is causing call failure.
I've shut down all such dial-peers and now everything works fine for me. I could've increased the timeout wait-release but curious to know if its a normal behavior of FXO ports.
I am trying to compare it with Dial-peers pointed to digital voice-ports (ISDN PRI), where when interface goes down, the dial-peers becomes OPERATIONAL DOWN.
I've Cisco 2811 running c2800nm-advipservicesk9-mz.124-11.T.bin.