diff --git a/app.js b/app.js
index e95cfc7..ef28d5f 100644
--- a/app.js
+++ b/app.js
@@ -130,7 +130,8 @@ const {
   wasOriginatedFromCarrier,
   getApplicationForDidAndCarrier,
   getOutboundGatewayForRefer,
-  getApplicationBySid
+  getApplicationBySid,
+  lookupAuthCarriersForAccountAndSP
 } = require('./lib/db-utils')(srf, logger);
 srf.locals = {
   ...srf.locals,
@@ -139,7 +140,8 @@ srf.locals = {
   getApplicationForDidAndCarrier,
   getOutboundGatewayForRefer,
   getFeatureServer: require('./lib/fs-tracking')(srf, logger),
-  getApplicationBySid
+  getApplicationBySid,
+  lookupAuthCarriersForAccountAndSP
 };
 const activeCallIds = srf.locals.activeCallIds;
 
@@ -148,7 +150,8 @@ const {
   handleSipRec,
   identifyAccount,
   checkLimits,
-  challengeDeviceCalls
+  challengeDeviceCalls,
+  identifyAuthTrunk
 } = require('./lib/middleware')(srf, logger);
 const CallSession = require('./lib/call-session');
 
@@ -236,7 +239,9 @@ srf.use('invite', [
   handleSipRec,
   identifyAccount,
   checkLimits,
-  challengeDeviceCalls
+  challengeDeviceCalls,
+  // challengeDeviceCalls will detect auth_trunk or device calls, identifyAuthTrunk have to be after that
+  identifyAuthTrunk
 ]);
 
 srf.invite((req, res) => {
diff --git a/lib/db-utils.js b/lib/db-utils.js
index 86638d8..5f2d415 100644
--- a/lib/db-utils.js
+++ b/lib/db-utils.js
@@ -65,6 +65,16 @@ AND vc.is_active = 1
 AND vc.register_sip_realm = ?
 AND vc.register_username = ?`;
 
+const sqlSelectAuthCarriersForAccountAndSP = `
+SELECT * FROM voip_carriers 
+WHERE trunk_type = 'auth' 
+AND is_active = 1 
+AND (
+  (account_sid = ?) 
+  OR 
+  (service_provider_sid = ? AND account_sid IS NULL)
+)`;
+
 const sqlSelectGatewaysByVoipCarrierSids = `
 SELECT sg.sip_gateway_sid, sg.voip_carrier_sid, vc.name, vc.service_provider_sid,
 vc.account_sid, vc.application_sid, sg.inbound, sg.outbound, sg.is_active, sg.ipv4, sg.netmask, sg.pad_crypto
@@ -579,12 +589,33 @@ module.exports = (srf, logger) => {
     return failure;
   };
 
+  /**
+   * Retrieves voip_carriers with trunk_type 'auth' that belong to either:
+   * 1. The specified account (account_sid matches), OR
+   * 2. The service provider but with null account_sid (shared across service provider)
+   *
+   * @param {string} account_sid - The SID of the account
+   * @param {string} service_provider_sid - The SID of the service provider
+   * @returns {Promise<Array>} Array of voip_carrier records matching the criteria
+   * @throws {Error} Database errors or other unexpected errors
+   */
+  const lookupAuthCarriersForAccountAndSP = async(account_sid, service_provider_sid) => {
+    try {
+      const [rows] = await pp.query(sqlSelectAuthCarriersForAccountAndSP, [account_sid, service_provider_sid]);
+      return rows;
+    } catch (err) {
+      logger.error({err, account_sid, service_provider_sid}, 'lookupAuthCarriersForAccountAndSP');
+      throw err;
+    }
+  };
+
   return {
     wasOriginatedFromCarrier,
     getApplicationForDidAndCarrier,
     getApplicationForDidAndCarriers,
     getOutboundGatewayForRefer,
     getSPForAccount,
-    getApplicationBySid
+    getApplicationBySid,
+    lookupAuthCarriersForAccountAndSP
   };
 };
diff --git a/lib/middleware.js b/lib/middleware.js
index e2b2acb..123ba9c 100644
--- a/lib/middleware.js
+++ b/lib/middleware.js
@@ -28,9 +28,9 @@ module.exports = function(srf, logger) {
     lookupAccountBySipRealm,
     lookupAccountBySid,
     lookupAccountCapacitiesBySid,
-    queryCallLimits
+    queryCallLimits,
   }  = srf.locals.dbHelpers;
-  const {stats, writeCdrs} = srf.locals;
+  const {stats, writeCdrs, lookupAuthCarriersForAccountAndSP, getApplicationForDidAndCarrier} = srf.locals;
 
   const initLocals = (req, res, next) => {
     const callId = req.get('Call-ID');
@@ -191,6 +191,10 @@ module.exports = function(srf, logger) {
           res.send(404);
           return req.srf.endSession(req);
         }
+        const auth_trunks = await lookupAuthCarriersForAccountAndSP(
+          account.account_sid,
+          account.service_provider_sid
+        );
 
         /* if this is a dedicated SBC (static IP) only take calls for that account's sip realm */
         if (process.env.SBC_ACCOUNT_SID && account.account_sid !== process.env.SBC_ACCOUNT_SID) {
@@ -214,6 +218,7 @@ module.exports = function(srf, logger) {
             registration_hook_username: account.registration_hook.username,
             registration_hook_password: account.registration_hook.password
           }),
+          ...(auth_trunks?.length && {auth_trunks}),
           ...req.locals
         };
       }
@@ -365,6 +370,38 @@ module.exports = function(srf, logger) {
     }
   };
 
+  const identifyAuthTrunk = async(req, res, next) => {
+    try {
+      if (req.authorization) {
+        const {grant} = req.authorization;
+        if (grant && grant.status === 'ok' && grant.auth_trunk) {
+          // we have successfully authenticated the call for an auth_trunk
+          const application_sid = await getApplicationForDidAndCarrier(req, grant.auth_trunk.voip_carrier_sid);
+
+          req.locals = {
+            ...req.locals,
+            originator: 'trunk',
+            carrier: grant.auth_trunk.name,
+            gateway: grant.auth_trunk,
+            voip_carrier_sid: grant.auth_trunk.voip_carrier_sid,
+            application_sid: application_sid || grant.auth_trunk.application_sid,
+          };
+          // as call from auth carrier, clean req.authorization that impact on legacy logic for authenticated user
+          delete req.authorization;
+
+          logger.debug({callId: req.locals.callId, auth_trunk: grant.auth_trunk.name},
+            'identifyAuthTrunk: call authenticated for auth trunk');
+        }
+      }
+      next();
+    } catch (err) {
+      stats.increment('sbc.terminations', ['sipStatus:500']);
+      logger.error(err, `${req.get('Call-ID')} Error challenging auth trunk`);
+      res.send(500);
+      req.srf.endSession(req);
+    }
+  };
+
   const challengeDeviceCalls = async(req, res, next) => {
     try {
       /* TODO: check if this is a gateway that we have an ACL for */
@@ -383,6 +420,7 @@ module.exports = function(srf, logger) {
     handleSipRec,
     challengeDeviceCalls,
     identifyAccount,
+    identifyAuthTrunk,
     checkLimits
   };
 };
diff --git a/test/db/jambones-sql.sql b/test/db/jambones-sql.sql
index 6961e73..67ad019 100644
--- a/test/db/jambones-sql.sql
+++ b/test/db/jambones-sql.sql
@@ -748,4 +748,4 @@ ALTER TABLE accounts ADD FOREIGN KEY device_calling_application_sid_idxfk (devic
 
 ALTER TABLE accounts ADD FOREIGN KEY siprec_hook_sid_idxfk (siprec_hook_sid) REFERENCES applications (application_sid);
 
-SET FOREIGN_KEY_CHECKS=0;
+SET FOREIGN_KEY_CHECKS=0;
\ No newline at end of file