Remote Service Discovery in the Service Location Protocol (SLP) via DNS SRV
Wenshuo Zhao, Henning G. Schulzrinne, E. Guttman, Chatschik C. Bisdikian, William Jerome · 2004
This document presents a lightweight method for remote Directory Agent (DA) discovery in the Service Location Protocol (SLP), which enables User Agents (UAs) to discover services in remote domains. A UA first makes a DNS query for SRV records of SLP DA service to get a list of DAs in a remote domain, then the UA obtains DAAdverts of all remote DAs via a single service:directory-agent:all Service Request (SrvRqst) or via multiple service:directory-agent SrvRqsts. Thus, the UA can discover remote services by querying remote DAs via unicast in the same way as it does in the local domain.