SIP Server - Group calls

[admin]

Run this once to update the config file. Modify SIP addresses as needed. If there's a call to user 200@192.168.0.9 then user 300@192.168.0.9 will also receive it.

Code:

io.writefile('/etc/kamailio/kamailio.cfg', [[
# modules
loadmodule "/usr/lib/kamailio/modules/tm.so"
loadmodule "/usr/lib/kamailio/modules/sl.so"
loadmodule "/usr/lib/kamailio/modules_k/rr.so"
loadmodule "/usr/lib/kamailio/modules_k/maxfwd.so"
loadmodule "/usr/lib/kamailio/modules_k/usrloc.so"
loadmodule "/usr/lib/kamailio/modules_k/registrar.so"

# rr, add value to ;lr param to make some broken UAs happy
modparam("rr", "enable_full_lr", 1)

route {
  if (!mf_process_maxfwd_header("10")) {
    sl_send_reply("483", "Too Many Hops");
    exit;
  };

  if (msg:len >= 2048) {
    sl_send_reply("513", "Message too big");
    exit;
  };

  if (method != "REGISTER") {
    record_route();
  };

  if (method == "INVITE") {
    if (uri == "sip:200@192.168.0.9;transport=udp") {
      append_branch("sip:300@192.168.0.9;transport=udp");
    };
  };

  if (loose_route()) {
    route(1);
    exit;
  };

  if (uri != myself) {
    route(1);
    exit;
  };

  if (uri == myself) {
    if (method == "REGISTER") {
      save("location");
      exit;
    };

    lookup("aliases");
    if (uri != myself) {
      route(1);
      exit;
    };

    if (!lookup("location")) {
      sl_send_reply("404", "Not Found");
      exit;
    };
  };

  route(1);
}

route[1] {
  if (!t_relay()) {
    sl_reply_error();
  };
}
]])

os.execute('/etc/init.d/kamailio restart')