Retronetworking » OCTOI - Osmocom Community TDM over IP

h1. Ladder Diagrams

h2. Initial connection setup

{{mscgen_link()

msc {

  hscale=2;

  client [label="Client"], server [label="Server (main port)"], worker [label="Server (worker port)"], hlr [label="HLR (database)"];

  |||;

  --- [label="Initial connection attempt from client to well-known server/port"];

  |||;

  client => server [label="HELLO_REQ (user_id)"];

  server <=> hlr [label="Obtain auth vectors"];

  client <= server [label="AUTH_REQ (rand, autn)"];

  client => server [label="AUTH_RESP (res)"];

  server box server [label="Verify res == xres?"];

  server => worker [label="Create worker socket"];

  server note server [label="Server accepts client + redirects to worker IP+Port"];

  client <= server [label="HELLO_ACK (worker IP:Port, token)"];

  ...;

  client => worker [label="HELLO_REQ (user_id, token)"];

  worker box worker [label="Verify user_id + token"];

  client <= worker [label="HELLO_ACK"];

  ...;

  client <=> worker [label="TDMoIP"];

  ...;

}

}}

h2. subsequent re-authentication

{{mscgen_link()

msc {

  hscale=2;

  client [label="Client"], server [label="Server (main port)"], worker [label="Server (worker port)"], hlr [label="HLR (database)"];

  |||;

  --- [label="At any later point in time, whenever the server wants"];

  worker <=> hlr [label="Obtain auth vectors"];

  client <= worker [label="AUTH_REQ (rand, autn)"];

  client => worker [label="AUTH_RESP (res)"];

  worker box worker [label="Verify res == xres?"];

}

}}