diff --git a/lib/middleware.js b/lib/middleware.js
index 4aee06a..56e3e1f 100644
--- a/lib/middleware.js
+++ b/lib/middleware.js
@@ -2,7 +2,7 @@ const debug = require('debug')('jambonz:sbc-inbound');
 const assert = require('assert');
 const Emitter = require('events');
 const parseUri = require('drachtio-srf').parseUri;
-const {nudgeCallCounts} = require('./utils');
+const {nudgeCallCounts, roundTripTime} = require('./utils');
 const msProxyIps = process.env.MS_TEAMS_SIP_PROXY_IPS ?
   process.env.MS_TEAMS_SIP_PROXY_IPS.split(',').map((i) => i.trim()) :
   [];
@@ -135,7 +135,8 @@ module.exports = function(srf, logger) {
   const identifyAccount = async(req, res, next) => {
     try {
       const {siprec, callId} = req.locals;
-      const {getSPForAccount, wasOriginatedFromCarrier, getApplicationForDidAndCarrier} = req.srf.locals;
+      const {getSPForAccount, wasOriginatedFromCarrier, getApplicationForDidAndCarrier, stats} = req.srf.locals;
+      const startAt = process.hrtime();
       const {
         fromCarrier,
         gateway,
@@ -144,6 +145,9 @@ module.exports = function(srf, logger) {
         service_provider_sid,
         account
       } = await wasOriginatedFromCarrier(req);
+      const rtt = roundTripTime(startAt);
+      stats.histogram('app.mysql.response_time', rtt, [
+        'query:wasOriginatedFromCarrier', 'app:sbc-inbound']);
       /**
        * calls come from 3 sources:
        * (1) A carrier