diff --git a/conf/sip_profiles/internal.xml b/conf/sip_profiles/internal.xml
index 3166538889..624f68c840 100644
--- a/conf/sip_profiles/internal.xml
+++ b/conf/sip_profiles/internal.xml
@@ -98,6 +98,8 @@
     <!--<param name="disable-transcoding" value="true"/>-->
     <!-- Used for when phones respond to a challenged ACK with method INVITE in the hash -->
     <!--<param name="NDLB-broken-auth-hash" value="true"/>-->
+    <!-- add a ;received="<ip>:<port>" to the contact when replying to register for nat handling -->
+    <!--<param name="NDLB-received-in-nat-reg-contact" value="true"/>-->
     <param name="auth-calls" value="true"/>
     <!-- on authed calls, authenticate *all* the packets not just invite -->
     <param name="auth-all-packets" value="false"/>
diff --git a/src/mod/endpoints/mod_sofia/sofia.c b/src/mod/endpoints/mod_sofia/sofia.c
index 419b076f24..6513613d70 100644
--- a/src/mod/endpoints/mod_sofia/sofia.c
+++ b/src/mod/endpoints/mod_sofia/sofia.c
@@ -1117,7 +1117,7 @@ switch_status_t config_sofia(int reload, char *profile_name)
 						switch_set_flag(profile, TFLAG_LATE_NEGOTIATION);
 					} else if (!strcasecmp(var, "inbound-proxy-media") && switch_true(val)) {
 						switch_set_flag(profile, TFLAG_PROXY_MEDIA);
-					} else if (!strcasecmp(var, "received-in-nat-reg-contact") && switch_true(val)) {
+					} else if (!strcasecmp(var, "NDLB-received-in-nat-reg-contact") && switch_true(val)) {
 						profile->pflags |= PFLAG_RECIEVED_IN_NAT_REG_CONTACT;
 					} else if (!strcasecmp(var, "aggressive-nat-detection") && switch_true(val)) {
 						profile->pflags |= PFLAG_AGGRESSIVE_NAT_DETECTION;