Alcatel Unleashed

I have a new setup OpenTouch Conversation 2.60.03.5 works well (incoming & outgoing calls) within local WiFi LAN. However from outside through the internet I am getting error "outgoing call error ... an error occurred while calling <extension>".

OTC sign om/off successfully, can perform other functions like forward my calls to any other extension.

Any sort of help is highly appreciated.

Thank you
MEH