BRIEF DESCRIPTION OF THE DRAWINGS
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention that together with the description serve to explain the principles of the invention, wherein:
FIG. 1 illustrates an embodiment of an IP Multimedia subsystem in which embodiments of the present invention may be implemented;
FIG. 2 illustrates an architectural model for providing presence services drawn by the 3rd Generation Partnership Project (3GPP) and the 3rd Generation Partnership Project 2 (3GPP2);
FIG. 3 illustrates another Open Mobile Alliance architectural model for providing presence services drawn by the Open Mobile Alliance (OMA), onto which the architectural model of FIG. 2 is mapped;
FIG. 4 illustrates steps implemented in an embodiment of the present invention; and
FIG. 5 illustrates steps implemented in an embodiment of the present invention.