[Users] Openser Presence Server

Dear all, I can use Openser to set up the Presence Server and connect it to my IMS platform. My question is: 1. It is possible to add the additional functionnality for Presence into Presence Server? Should i modify the code source directly? 2. Because in a environment IMS, higher application can be developped based on Enabling Services which include Presence, IM, etc. So can Openser be interact with other SIP AS? How? Thanks for give some hint or documentation lien, i am not very familiar with Openser. Best Regards, li _________________________________________________________________ Gagnez des écrans plats avec Live.com http://www.image-addict.fr/