H.350 provides directory services for a variety of conferencing protocols including H.323, SIP, H.320 and non-standard protocols. It makes it easy to find and dial users, support identity management to allow for high scalability in deployments, and store user call handling preferences.

Resources: H.350 Information Site, VoIP Information Site

See Also: Voice over IP (VoIP), Videoconferencing (VC), H.323, Session Initiation Protocol (SIP)