person-to-person

详细解释:a. 在指名受话人受话后才索费的, 通过个人接触进行的
ad. 个人对个人地, 面对面地

英语解释：

形容词 person-to-person:

involving direct communication or contact between persons or parties

副词 person-to-person:

(of two persons) in direct encounter同义词：one-on-one