i never heard such a thing before, as i know you coldnt setup trunk on the FXS port due to this lines for single users or fax devices, what do you need this. if you need trunk between router and pbx you need to have a BRI/PRI or FXO line.
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.