Is this CME or acting as a gateway for CUCM? If a gateway, are you using SIP or H.323? It might be complaining about something sent in the H.225 Connect message or the SIP 200OK for the connected number format when it tries to relate that via Q931 to the PSTN.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.