A METHOD FOR SENDING AND RECEIVING THE OFF-LINE MESSAGE, A CLIENT APPARATUS, A SERVER AND A SYSTEM

摘要

A method for sending/receiving an offline message is provided. An offline message sending client sends the offline message to an offline message processing server of an offline message receiver through a message session relay protocol (MSRP) channel, and then the offline message processing server stores the received offline message. An offline message receiving client obtains the offline message stored in the offline message processing server through an MSRP channel. Further, the establishment of an MSRP channel varies upon the fact whether an instant messaging (IM) server of the client participates in the establishment process. Thereby, the present invention provides a complete solution for offline message in a session initiation protocol (SIP)/SIP for instant messaging and presence leveraging extensions (SIMPLE) IM service system.