As Noojee CTI needs to access a remote system (your Noojee PBX) you need to add a remote site setting.
In setup search 'Remote Site Settings'
Click 'New REmote Remote Site'
Remote Site Name: NoojeeContactPBX
Remote Site URL: url to your pbx e.g. https://pabx.clouddialer.com.au
Disable Protocol Security - off
DescriptionNoojee Description: Noojee Contact PBX
Active - on
Click 'Save'