If you are looking to host your own server and are not too tied to XMPP, you can use Kamailio as a SIP + XCAP chat VoIP/Video and IM server with TLS encryption

If you are looking to host your own server and are not too tied to XMPP, you can use Kamailio as a SIP + XCAP chat VoIP/Video and IM server with TLS encryption and Use Jitsi as a softphone/chat client. Here's a tutorial to get you started http://kb.asipto.com/kamailio:skype-like-service-in-less-than-one-hour http://kb.asipto.com/kamailio:skype-like-service-in-less-tha... You can always try to implement the same with freeswitch or if XMPP is a must you can use something like OpenFire (http://www.igniterealtime.org/projects/openfire/ http://www.igniterealtime.org/projects/openfire/)