Its the introductory message that Assistant's begins the call with once the contacts answer the call
Steps to Set up Call opening Message of an Assistant :
Click on the Assistant you want to add call opening message for.
Fill in the Welcome Message in the Welcome Message tab
Click "Save".
It is mandatory to write the welcome message in the same language as selected in language tab. If i want my assistant to speak in Arabic, then my welcome message must be in Arabic, script can be in any language.
Congratulations you have successfully added Welcome Message of your Assistant !!๐๐