https://app.kbone.net/vault/rfc/docid/4327
RFC0395: Switch Settings on IMPs and TIPs
Network Working Group John M. McQuillan RFC # 395 Bolt Beranek and Newman Inc. NIC # 11587 3 October 1972 Categories: Updates: Obsoletes: SWITCH SETTINGS ON IMPS AND TIPS ...
https://app.kbone.net/vault/rfc/docid/4754
RFC4354: A Session Initiation Protocol (SIP) Event Package and Data Format for Various Settings in Support for the Push-to-Talk over Cellular (PoC) Service
Network Working Group M. Garcia-Martin Request for Comments: 4354 Nokia Category: Informational January 2006 A Session Initiation Protocol (SIP) Event Package and Data Format ...