As I figured out this functionality is already implemented into the Event and Present Framework of the SIMPLE Module of PJSIP. http://www.pjsip.org/pjsip/docs/html/group__PJSIP__SIMPLE__PUBLISH.htm http://www.pjsip.org/pjsip/docs/html/group__PJSIP__EVENT__NOT.htm I guess an exemplary implementation can be found in the implementation of the PJSUA Application: http://www.pjsip.org/pjsip/docs/html/group__PJSUA__LIB__BUDDY.htm I was wondering how I could use this functionality to create an own PUBLISH, SUBSCRIBE and NOTIFY service, without having to reinvent the wheel. I am thinking here to exchange game coordinates of a game between Users, instead of the buddy online status. Like this I could use this service as a Network Layer for a Game. Cheers Thomas -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20080129/669a4263/attachment.html