[Name] connectionid [Required] false [Attribute Constraints] Must not be used with conferenceid. [Type] ECMAScript Expression [Default Value] none [Valid Values] Connection IDs [Description] 
An Optional ECMAScript expression which returns the identifier of a connection. The specified connection must be associated with the dialog being prepared. If both the connectionid and the conferenceid are omitted and the dialog was previously prepared using a dialogprepare element with a connectionid or conferenceid specified, the interpreter must use the id as specified on the dialogprepare element. If neither the connectionid or conferenceid is specified and the dialog had not previously been prepared, the interpreter must use the id indicated in the current event being processed. For more information about connections and bridges, refer to Section 10 . If both connectionid and conferenceid are specified, an error.fetch event must be thrown.