(3)Information should normally be exchanged in writing. However, oral communications should be possible in appropriate cases, including, in particular, before a written request for cooperation or exchange of information is sent, to provide information on an upcoming request for cooperation or exchange of information, or to discuss any issues that might make it difficult to comply with that request. In urgent cases, it should also be possible to orally communicate a request for cooperation or exchange of information, provided that such urgency is not due to a delay on the part of the submitting party.