diff --git a/app.js b/app.js
index 86dfd60..bd49cd0 100644
--- a/app.js
+++ b/app.js
@@ -55,7 +55,8 @@ const {
   lookupAccountBySid,
   lookupAccountCapacitiesBySid,
   queryCallLimits,
-  lookupClientByAccountAndUsername
+  lookupClientByAccountAndUsername,
+  lookupSystemInformation
 } = require('@jambonz/db-helpers')({
   host: process.env.JAMBONES_MYSQL_HOST,
   port: process.env.JAMBONES_MYSQL_PORT || 3306,
@@ -91,6 +92,7 @@ srf.locals = {...srf.locals,
   AlertType,
   activeCallIds: new Map(),
   getRtpEngine,
+  privateNetworkCidr: process.env.PRIVATE_VOIP_NETWORK_CIDR || null,
   dbHelpers: {
     pool,
     ping,
@@ -102,7 +104,8 @@ srf.locals = {...srf.locals,
     lookupAccountBySipRealm,
     lookupAccountCapacitiesBySid,
     queryCallLimits,
-    lookupClientByAccountAndUsername
+    lookupClientByAccountAndUsername,
+    lookupSystemInformation
   },
   realtimeDbHelpers: {
     createSet,
@@ -273,10 +276,18 @@ if (process.env.K8S || process.env.HTTP_PORT) {
     });
 }
 if ('test' !== process.env.NODE_ENV) {
-  /* update call stats periodically */
-  setInterval(() => {
+  /* update call stats periodically as well as definition of private network cidr */
+  setInterval(async() => {
     stats.gauge('sbc.sip.calls.count', activeCallIds.size,
       ['direction:inbound', `instance_id:${process.env.INSTANCE_ID || 0}`]);
+
+    const r = await lookupSystemInformation();
+    if (r) {
+      if (r.private_network_cidr !== srf.locals.privateNetworkCidr) {
+        logger.info(`updating private network cidr from ${srf.locals.privateNetworkCidr} to ${r.private_network_cidr}`);
+        srf.locals.privateNetworkCidr = r.private_network_cidr;
+      }
+    }
   }, 20000);
 }
 
diff --git a/lib/utils.js b/lib/utils.js
index 4b4a239..f792eef 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -202,9 +202,16 @@ const isMSTeamsCIDR = (ip) => {
 };
 
 const isPrivateVoipNetwork = (ip) => {
-  if (process.env.PRIVATE_VOIP_NETWORK_CIDR) {
-    const matcher = new CIDRMatcher(process.env.PRIVATE_VOIP_NETWORK_CIDR.split(','));
-    return matcher.contains(ip);
+  const {srf, logger} = require('..');
+  const {privateNetworkCidr} = srf.locals;
+  if (privateNetworkCidr) {
+    try {
+      const matcher = new CIDRMatcher(privateNetworkCidr.split(','));
+      return matcher.contains(ip);
+    } catch (err) {
+      logger.info({err, privateNetworkCidr},
+        'Error checking private network CIDR, probably misconfigured must be a comma separated list of CIDRs');
+    }
   }
   return false;
 };
diff --git a/package-lock.json b/package-lock.json
index 704af5c..61cf85b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -11,7 +11,7 @@
       "dependencies": {
         "@aws-sdk/client-auto-scaling": "^3.549.0",
         "@aws-sdk/client-sns": "^3.549.0",
-        "@jambonz/db-helpers": "^0.9.4",
+        "@jambonz/db-helpers": "^0.9.7",
         "@jambonz/digest-utils": "^0.0.5",
         "@jambonz/http-health-check": "^0.0.1",
         "@jambonz/realtimedb-helpers": "^0.8.8",
@@ -1410,13 +1410,13 @@
       }
     },
     "node_modules/@jambonz/db-helpers": {
-      "version": "0.9.6",
-      "resolved": "https://registry.npmjs.org/@jambonz/db-helpers/-/db-helpers-0.9.6.tgz",
-      "integrity": "sha512-uvtkqdP6GP6KSaM7eo2jcU1k0R6Ymodhl0RH/XiNESgIhZ7sx7ZnMQtrZQVVmzrJ429H7q8dQqgcB2YhAyEK+A==",
+      "version": "0.9.7",
+      "resolved": "https://registry.npmjs.org/@jambonz/db-helpers/-/db-helpers-0.9.7.tgz",
+      "integrity": "sha512-5qN/CJZJXpbMkMn+8gFn8PpQ0ZImZxp1EjKyxLUlmMn+xgjeNb29c3pjeVt/6EQnBB65jAax6TNsVzVIfpvE2w==",
       "dependencies": {
         "cidr-matcher": "^2.1.1",
         "debug": "^4.3.4",
-        "mysql2": "^3.10.3",
+        "mysql2": "^3.11.0",
         "node-object-hash": "^2.3.10",
         "uuid": "^8.3.2"
       }
@@ -7889,13 +7889,13 @@
       "dev": true
     },
     "@jambonz/db-helpers": {
-      "version": "0.9.6",
-      "resolved": "https://registry.npmjs.org/@jambonz/db-helpers/-/db-helpers-0.9.6.tgz",
-      "integrity": "sha512-uvtkqdP6GP6KSaM7eo2jcU1k0R6Ymodhl0RH/XiNESgIhZ7sx7ZnMQtrZQVVmzrJ429H7q8dQqgcB2YhAyEK+A==",
+      "version": "0.9.7",
+      "resolved": "https://registry.npmjs.org/@jambonz/db-helpers/-/db-helpers-0.9.7.tgz",
+      "integrity": "sha512-5qN/CJZJXpbMkMn+8gFn8PpQ0ZImZxp1EjKyxLUlmMn+xgjeNb29c3pjeVt/6EQnBB65jAax6TNsVzVIfpvE2w==",
       "requires": {
         "cidr-matcher": "^2.1.1",
         "debug": "^4.3.4",
-        "mysql2": "^3.10.3",
+        "mysql2": "^3.11.0",
         "node-object-hash": "^2.3.10",
         "uuid": "^8.3.2"
       }
diff --git a/package.json b/package.json
index 9186b15..b064c06 100644
--- a/package.json
+++ b/package.json
@@ -26,7 +26,7 @@
     "jslint:fix": "npm run jslint --fix"
   },
   "dependencies": {
-    "@jambonz/db-helpers": "^0.9.4",
+    "@jambonz/db-helpers": "^0.9.7",
     "@jambonz/http-health-check": "^0.0.1",
     "@jambonz/realtimedb-helpers": "^0.8.8",
     "@jambonz/rtpengine-utils": "^0.4.4",