有声信函业务,是用户将盒式录音磁带装在专用信封里,按挂号信函交寄的一项邮政业务。最先开办国内有声信函业务的是天津市邮电局,于1987年1月15日开办。北京市邮电局于1987年3月1日开办,其他一些地方邮电局也相继开办过此项业务。国内有声信函的邮寄费为各省市邮电管理局自行规定,寄外埠邮费在0.8元至1元之间。有声信函业务使用范围并不广,且邮局仅在20世纪 Voice mail business, the user will tape cassette tape installed in a dedicated envelope, by registered mail, postal mail of a postal business. The first to open a domestic voice mail business is the Tianjin Post Office, opened in January 15, 1987. The Beijing Municipal Post and Telecommunication Bureau was opened on March 1, 1987 and some other local post offices also started the business one after another. The mailing fee for domestic audio mail is stipulated by the postal administration of each province and municipality on its own, and the postage of postal service at other places shall be between 0.8 yuan and 1 yuan. Voice mail business is not widely used, and the post office only in the 20th century