@techreport{beijar_specialassignment,
  author = {Nicklas Beijar},
  title = {Signaling Protocols for Internet Telephony - Architectures Based on H.323 and SIP},
  year = {1998},
  type = {Special Assignment},
  url = {http://keskus.hut.fi/tutkimus/ipana/paperit/sip.pdf},
}