System and method for presence subscription delegation

A method for presence subscription delegation, the method comprising the following computer-implemented steps:

• receiving, by a presence subscription delegation handler, a presence subscription delegation request from a watcher;
• performing, by the presence subscription delegation handler, delegation authorization for the presence subscription delegation request according to a presence delegation authorization rule of a delegating user being authorization information about presence subscription delegation, wherein the delegation authorization determines whether the delegating user has delegated authority of the presence subscription delegation request for a presence information about a presentity authorized to the delegating user to the watcher for requesting presence subscription on behalf of the delegating user;
• transmitting, by the presence subscription delegation handler, the presence subscription delegation request to a presence server of a presentity, if the delegation authorization is successful;
• receiving presence information about the presentity from the presence server after the presence server performs presence authorization according to a presence authorization rule of the presentity;
• and
• transmitting, by the presence subscription delegation handler, the presence information about the presentity to the watcher,
• wherein the presence subscription delegation request is transmitted from the watcher as a delegated user and the delegated user requests the presence information about the presentity on behalf of a delegating user, and
• wherein the delegating user sets the presence subscription delegation to the watcher.