be prescribed by the parties

基本解释

Article 10 In case the receiving of any data message needs to be confirmed as prescribed by laws and administrative regulations or the stipulations of the parties, the receiving shall be confirmed.
第十条法律、行政法规规定或者当事人约定数据电文需要确认收讫的，应当确认收讫。
Unless it is otherwise prescribed by any law or is otherwise stipulated by the parties concerned, when the obligee's rights are alienated, the mortgage right thereof shall be alienated concurrently.
债权转让的，担保该债权的抵押权一并转让，但法律另有规定或者当事人另有约定的除外。