Method and apparatus for implementing the CNAP service

A calling information service apparatus for implementing a calling name presentation (CNAP) service, comprising:

• a service processing unit, adapted to receive a service request sent by a switching system, wherein the service request carries an identifier of a calling party and an identifier of a called party, obtain calling information set by the calling party according to the identifier of the calling party, and send a flash message that carries the calling information to a called terminal according to location information of the called party when determining that the called terminal rings;
• and
• a location querying unit, adapted to obtain the location information of the called party according to the identifier of the called party,
• wherein the called terminal rings when a set delay timer times out;
• and
• the service processing unit further comprises a processing subunit and a controlling subunit;
• the processing subunit is adapted to receive calling information request from a originating office according to subscription information of the calling party, obtain the calling information set by the calling arty according to the identifier of the calling party, and send the flash message that carries the calling information to the called party according to the location information of the called party when receives an instruction from the controlling subunit;
• and
• the controlling subunit is adapted to judge whether the called terminal rings, and instruct the processing subunit to send the flash message when determining that the called terminal rings according to a set delay time.