[Kamailio-Users] Contact of reply for SUBSCRIBE

Hi all, Kamailio sends a Contact set to modparam "server_address" in the "presence" module when replying to SUBSCRIBE. Now I've seen in some clients (e.g. eyebeam) and libs (e.g. eXosip) that they send subsequent SUBSCRIBEs to this contact. In case of eXosip, it's for automatically refreshing the subscription. Problem is, that I can't tell what to put into "server_address" to handle this correctly, since just putting in the domain of my server (like "sip:my.domain") doesn't work, and putting in some generic URI like "sip:server@my.domain") doesn't make sense also, since the user doesn't exist. So, how are you supposed to handle this? Any thoughts? Andreas