SIP | Kyriakos Papadopoulos

    __ __           _       __
   / //_/_  _______(_)___ _/ /______  _____
  / ,< / / / / ___/ / __ `/ //_/ __ \/ ___/
 / /| / /_/ / /  / / /_/ / ,< / /_/ (__  )
/_/ |_\__, /_/  /_/\__,_/_/|_|\____/____/
     /____/
    ____                        __                        __
   / __ \____ _____  ____ _____/ /___  ____  ____  __  __/ /___  _____
  / /_/ / __ `/ __ \/ __ `/ __  / __ \/ __ \/ __ \/ / / / / __ \/ ___/
 / ____/ /_/ / /_/ / /_/ / /_/ / /_/ / /_/ / /_/ / /_/ / / /_/ (__  )
/_/    \__,_/ .___/\__,_/\__,_/\____/ .___/\____/\__,_/_/\____/____/
           /_/                     /_/

IPoUGRS: IP over Unanswered GSM Ring Signals

IPoUGRS is a protocol for transmitting IP datagrams over the GSM ring signal. Eight phones ring in parallel — a ring is a 1, silence is a 0 — producing one octet per time slot at a theoretical maximum of 1.6 bits per second. The caller hangs up before anyone answers. This is not considered rude. It is the physical layer. The protocol is specified as an IETF Internet-Draft (draft-papadopoulos-ipougrs-00 ) in the tradition of RFC 1149 (IP over Avian Carriers) and RFC 2324 (HTCPCP). ...