[Freeswitch-users] Sofia SIP Subscription For External Events

Hi Guys, I'm going to use OpenSER as SIP Platform (Registrar, Proxy, Presence) and FreeSWITCH in my application. So I need to subscribe the FreeSWITCH for presence information of users who involve in the application. After some looking of Sofia.conf.xml , it seems there is not support to doing so, Is it right ? appreciate all comments, -- afshin