Hypertext Transfer Protocol (HTTP) Digest Authentication Using Authentication and Key Agreement (AKA). - Aki Niemi; Jari Arkko; Vesa Torvinen (RFC, 2002)

Security Mechanism Agreement for the Session Initiation Protocol (SIP). - Jari Arkko; Vesa Torvinen; Gonzalo Camarillo; Aki Niemi; Tao Haukka (RFC, 2003)

Session Initiation Protocol (SIP) Extension for Event State Publication. - Aki Niemi (RFC, 2004)

Publication of Partial Presence Information. - Aki Niemi; Mikko Lonnfors; Eva Leppanen (RFC, 2008)

Referring to Multiple Resources in the Session Initiation Protocol (SIP). - Gonzalo Camarillo; Aki Niemi; Markus Isomäki; Miguel A. Garcia-Martin; Hisham Khartabil (RFC, 2008)

An Extension to Session Initiation Protocol (SIP) Events for Conditional Event Notification. - Aki Niemi; Dean Willis (RFC, 2010)

Session Initiation Protocol (SIP) Event Notification Extension for Notification Rate Control. - Aki Niemi; Krisztian Kiss; Salvatore Loreto (RFC, 2012)

Multi-party Chat Using the Message Session Relay Protocol (MSRP). - Aki Niemi; Miguel A. Garcia-Martin; Geir A. Sandbakken (RFC, 2015)