Gets and sets the telephone number for the remote server to call back on.
A string which specifies the callback telephone number.
Setting the CallbackNumber property specifies that the server should call the user back at the given telephone number. This property is ignored unless the user has "Set By Caller" callback permission on the server. Assigning an asterisk to this property causes the number stored in the phone book entry to be used for callback.
InternetDialer Class | SocketTools Namespace