revamp to mysql for gateway configuration and major code refactor

lib/utils.js

@@ -1,16 +1,6 @@
 const config = require('config');
 let idx = 0;
 
-function fromInboundTrunk(req) {
-  const trunks = config.has('trunks.inbound') ?
-    config.get('trunks.inbound') : [];
-  if (isWSS(req)) return false;
-  const trunk = trunks.find((t) => t.host.includes(req.source_address));
-  if (!trunk) return false;
-  req.carrier_name = trunk.name;
-  return true;
-}
-
 function isWSS(req) {
   return req.getParsedHeader('Via')[0].protocol.toLowerCase().startsWith('ws');
 }
@@ -34,7 +24,6 @@ function makeRtpEngineOpts(req, srcIsUsingSrtp, dstIsUsingSrtp) {
 }
 
 module.exports = {
-  fromInboundTrunk,
   isWSS,
   getAppserver,
   makeRtpEngineOpts