diff --git a/lib/NGCP/Panel/Utils/Preferences.pm b/lib/NGCP/Panel/Utils/Preferences.pm
index f438188896..f57369e477 100644
--- a/lib/NGCP/Panel/Utils/Preferences.pm
+++ b/lib/NGCP/Panel/Utils/Preferences.pm
@@ -2778,7 +2778,7 @@ sub update_sems_peer_auth {
 sub get_peer_auth_params {
     my ($c, $prov_subscriber, $prefs) = @_;
 
-    foreach my $attribute (qw/peer_auth_user peer_auth_hf_user peer_auth_realm peer_auth_pass peer_auth_register/){
+    foreach my $attribute (qw/peer_auth_user peer_auth_hf_user peer_auth_realm peer_auth_registrar_server peer_auth_pass peer_auth_register/){
         my $rs;
         $rs = get_usr_preference_rs(
             c => $c,
diff --git a/lib/NGCP/Panel/Utils/Sems.pm b/lib/NGCP/Panel/Utils/Sems.pm
index ed76fda0b9..5bb87bc7d0 100644
--- a/lib/NGCP/Panel/Utils/Sems.pm
+++ b/lib/NGCP/Panel/Utils/Sems.pm
@@ -97,6 +97,9 @@ sub create_peer_registration {
     # use the value of the peer_auth_user instead
     my $authorization_username = $$prefs{peer_auth_hf_user} // $$prefs{peer_auth_user};
 
+    # if there a specific registrar server defined, provide it. Otherwise use realm's value.
+    my $registrar_server = $$prefs{peer_auth_registrar_server} // $$prefs{peer_auth_realm};
+
     my @ret = NGCP::Panel::Utils::XMLDispatcher::dispatch($c, "appserver", $all, 1, <<EOF);
 <?xml version="1.0"?>
   <methodCall>
@@ -109,6 +112,7 @@ sub create_peer_registration {
       <param><value><string>sip:$$prefs{peer_auth_user}\@$contact;uuid=$uuid$transport</string></value></param>
       <param><value><string>$authorization_username</string></value></param>
       <param><value><string>$type</string></value></param>
+      <param><value><string>$registrar_server</string></value></param>
     </params>
   </methodCall>
 EOF
@@ -219,6 +223,9 @@ sub update_peer_registration {
     # use the value of the peer_auth_user instead
     my $authorization_username = $$prefs{peer_auth_hf_user} // $$prefs{peer_auth_user};
 
+    # if there a specific registrar server defined, provide it. Otherwise use realm's value.
+    my $registrar_server = $$prefs{peer_auth_registrar_server} // $$prefs{peer_auth_realm};
+
     my @ret = NGCP::Panel::Utils::XMLDispatcher::dispatch($c, "appserver", $all, 1, <<EOF);
 <?xml version="1.0"?>
   <methodCall>
@@ -231,6 +238,7 @@ sub update_peer_registration {
       <param><value><string>sip:$$prefs{peer_auth_user}\@$contact;uuid=$uuid$transport</string></value></param>
       <param><value><string>$authorization_username</string></value></param>
       <param><value><string>$type</string></value></param>
+      <param><value><string>$registrar_server</string></value></param>
     </params>
   </methodCall>
 EOF
@@ -243,6 +251,9 @@ EOF
     # use the value of the peer_auth_user instead
     my $old_authorization_username = $$oldprefs{peer_auth_hf_user} // $$oldprefs{peer_auth_user};
 
+    # if there a specific registrar server defined, provide it. Otherwise use realm's value.
+    my $old_registrar_server = $$oldprefs{peer_auth_registrar_server} // $$oldprefs{peer_auth_realm};
+
     if(grep { $$_[1] == 0 or $$_[2] !~ m#<value>OK</value># } @ret) {  # error
         $c->log->error("Failed XML-RPC call to appserver: ". Dumper \@ret);
 
@@ -260,6 +271,7 @@ EOF
           <param><value><string>sip:$$oldprefs{peer_auth_user}\@$contact;uuid=$uuid</string></value></param>
           <param><value><string>$old_authorization_username</string></value></param>
           <param><value><string>$type</string></value></param>
+          <param><value><string>$old_registrar_server</string></value></param>
         </params>
       </methodCall>
 EOF
@@ -328,6 +340,9 @@ EOF
     # use the value of the peer_auth_user instead
     my $old_authorization_username = $$oldprefs{peer_auth_hf_user} // $$oldprefs{peer_auth_user};
 
+    # if there a specific registrar server defined, provide it. Otherwise use realm's value.
+    my $old_registrar_server = $$oldprefs{peer_auth_registrar_server} // $$oldprefs{peer_auth_realm};
+
     if(grep { $$_[1] == 0 or $$_[2] !~ m#<value>OK</value># } @ret) {  # error
         $c->log->error("Failed XML-RPC call to appserver: ". Dumper \@ret);
 
@@ -345,6 +360,7 @@ EOF
       <param><value><string>sip:$$oldprefs{peer_auth_user}\@$contact;uuid=$uuid</string></value></param>
       <param><value><string>$old_authorization_username</string></value></param>
       <param><value><string>$type</string></value></param>
+      <param><value><string>$old_registrar_server</string></value></param>
     </params>
   </methodCall>
 EOF