diff --git a/lib/regbot.js b/lib/regbot.js
index 08b76b3..4d5b7c1 100644
--- a/lib/regbot.js
+++ b/lib/regbot.js
@@ -204,14 +204,14 @@ class Regbot {
         }));
 
         // for reg trunks, create ephemeral set of IP addresses for inbound gateways
-        if (this.trunk_type === 'reg') {
+        if (this.trunk_type === 'reg' && !isValidIPv4(this.ipv4)) {
           this.addresses = [];
           if (this.port) {
-            const addrs = await dnsResolverA(this.logger, this.sip_realm);
+            const addrs = await dnsResolverA(this.logger, this.ipv4);
             this.addresses.push(...addrs);
           }
           else {
-            const addrs = await dnsResolverSrv(this.logger, this.sip_realm, this.transport);
+            const addrs = await dnsResolverSrv(this.logger, this.ipv4, this.transport);
             this.addresses.push(...addrs);
           }