(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 about that upcoming request for cooperation or to discuss any issues that might make it difficult to carry out that request. In urgent cases, it should also be possible for a request for cooperation to be communicated orally, provided such urgency is not simply due to a delay on the part of the requesting party.