diff --git a/app/ring_groups/ring_group_edit.php b/app/ring_groups/ring_group_edit.php
index d5307436b..74a99e4eb 100644
--- a/app/ring_groups/ring_group_edit.php
+++ b/app/ring_groups/ring_group_edit.php
@@ -67,6 +67,33 @@
 	$destination_delay_max = $settings->get('ring_group', 'destination_delay_max', '');
 	$destination_timeout_max = $settings->get('ring_group', 'destination_timeout_max', '');
 
+// Set variables from http GET parameters
+	$page = is_numeric($_GET['page'] ?? '') ? $_GET['page'] : 0;
+	$order_by = preg_replace('#[^a-zA-Z0-9_\-]#', '', ($_GET['order_by'] ?? 'ring_group_name'));
+	$order = ($_GET['order'] ?? '') === 'desc' ? 'desc' : 'asc';
+	$sort = $order_by == 'ring_group_extension' ? 'natural' : null;
+	$search = $_GET['search'] ?? '';
+	$show = $_GET['show'] ?? '';
+
+// Build the query string
+	$param = [];
+	if (!empty($page)) {
+		$param['page'] = $page;
+	}
+	if (!empty($_GET['order_by'])) {
+		$param['order_by'] = $order_by;
+	}
+	if (!empty($_GET['order'])) {
+		$param['order'] = $order;
+	}
+	if (!empty($search)) {
+		$param['search'] = $search;
+	}
+	if (!empty($show) && $show == 'all' && permission_exists('ring_group_all')) {
+		$param['show'] = $show;
+	}
+	$query_string = http_build_query($param);
+
 //get the domain_uuid
 	$domain_uuid = $_SESSION['domain_uuid'];
 	$domain_name = $_SESSION['domain_name'];
@@ -132,7 +159,7 @@
 			message::add($text['message-delete']);
 
 			//redirect the browser
-			header("Location: ring_group_edit.php?id=$ring_group_uuid");
+			header("Location: ring_group_edit.php?id=".$ring_group_uuid.($query_string ? '&'.$query_string : ''));
 			exit;
 	}
 
@@ -146,7 +173,7 @@
 
 		if (is_numeric($settings->get('limit', 'ring_groups', '')) && $total_ring_groups >= $settings->get('limit', 'ring_groups', '')) {
 			message::add($text['message-maximum_ring_groups'].' '.$settings->get('limit', 'ring_groups', ''), 'negative');
-			header('Location: ring_groups.php');
+			header('Location: ring_groups.php'.($query_string ? '?'.$query_string : ''));
 			exit;
 		}
 	}
@@ -174,7 +201,7 @@
 						break;
 				}
 
-				header('Location: ring_groups.php');
+				header('Location: ring_groups.php'.($query_string ? '?'.$query_string : ''));
 				exit;
 			}
 
@@ -269,7 +296,7 @@
 		message::add($text['message-add']);
 
 		//redirect the browser
-		header("Location: ring_group_edit.php?id=".urlencode($ring_group_uuid));
+		header("Location: ring_group_edit.php?id=".urlencode($ring_group_uuid).($query_string ? '&'.$query_string : ''));
 		exit;
 	}
 
@@ -280,7 +307,7 @@
 			$token = new token;
 			if (!$token->validate($_SERVER['PHP_SELF'])) {
 				message::add($text['message-invalid_token'],'negative');
-				header('Location: ring_groups.php');
+				header('Location: ring_groups.php'.($query_string ? '?'.$query_string : ''));
 				exit;
 			}
 
@@ -544,7 +571,7 @@
 			}
 
 		//redirect the browser
-			header("Location: ring_group_edit.php?id=".urlencode($ring_group_uuid));
+			header("Location: ring_group_edit.php?id=".urlencode($ring_group_uuid).($query_string ? '&'.$query_string : ''));
 			exit;
 	}
 
@@ -746,7 +773,7 @@
 	echo "<div class='action_bar' id='action_bar'>\n";
 	echo "	<div class='heading'><b>".$text['title-ring_group']."</b></div>\n";
 	echo "	<div class='actions'>\n";
-	echo button::create(['type'=>'button','label'=>$text['button-back'],'icon'=>$settings->get('theme', 'button_icon_back'),'id'=>'btn_back','link'=>'ring_groups.php']);
+	echo button::create(['type'=>'button','label'=>$text['button-back'],'icon'=>$settings->get('theme', 'button_icon_back'),'id'=>'btn_back','link'=>'ring_groups.php'.($query_string ? '?'.$query_string : '')]);
 	if ($action == 'update') {
 		$button_margin = 'margin-left: 15px;';
 		if (permission_exists('ring_group_add') && (empty($settings->get('limit', 'ring_groups', '')) || ($total_ring_groups < $settings->get('limit', 'ring_groups', '')))) {
diff --git a/app/ring_groups/ring_groups.php b/app/ring_groups/ring_groups.php
index 4dd009e4e..5ade46a3a 100644
--- a/app/ring_groups/ring_groups.php
+++ b/app/ring_groups/ring_groups.php
@@ -17,7 +17,7 @@
 
 	The Initial Developer of the Original Code is
 	Mark J Crane <markjcrane@fusionpbx.com>
-	Portions created by the Initial Developer are Copyright (C) 2010-2025
+	Portions created by the Initial Developer are Copyright (C) 2010-2026
 	the Initial Developer. All Rights Reserved.
 
 	Contributor(s):
@@ -40,16 +40,36 @@
 	$language = new text;
 	$text = $language->get();
 
-//set additional variables
-	$show = $_GET["show"] ?? '';
+// Set variables from http GET parameters
+	$page = is_numeric($_GET['page'] ?? '') ? $_GET['page'] : 0;
+	$order_by = preg_replace('#[^a-zA-Z0-9_\-]#', '', ($_GET['order_by'] ?? 'ring_group_name'));
+	$order = ($_GET['order'] ?? '') === 'desc' ? 'desc' : 'asc';
+	$sort = $order_by == 'ring_group_extension' ? 'natural' : null;
+	$search = $_GET['search'] ?? '';
+	$show = $_GET['show'] ?? '';
 
-//set the defaults
-	$search = '';
+// Build the query string
+	$param = [];
+	if (!empty($page)) {
+		$param['page'] = $page;
+	}
+	if (!empty($_GET['order_by'])) {
+		$param['order_by'] = $order_by;
+	}
+	if (!empty($_GET['order'])) {
+		$param['order'] = $order;
+	}
+	if (!empty($search)) {
+		$param['search'] = $search;
+	}
+	if (!empty($show) && $show == 'all' && permission_exists('ring_group_all')) {
+		$param['show'] = $show;
+	}
+	$query_string = http_build_query($param);
 
 //get posted data
 	if (!empty($_POST['ring_groups'])) {
 		$action = $_POST['action'];
-		$search = $_POST['search'] ?? '';
 		$ring_groups = $_POST['ring_groups'];
 	}
 
@@ -63,7 +83,7 @@
 
 		if (is_numeric($settings->get('limit', 'ring_groups', '')) && $total_ring_groups >= $settings->get('limit', 'ring_groups', '')) {
 			message::add($text['message-maximum_ring_groups'].' '.$settings->get('limit', 'ring_groups', ''), 'negative');
-			header('Location: ring_groups.php');
+			header('Location: ring_groups.php'.($query_string ? '?'.$query_string : ''));
 			exit;
 		}
 	}
@@ -85,20 +105,10 @@
 				break;
 		}
 
-		header('Location: ring_groups.php'.($search != '' ? '?search='.urlencode($search) : ''));
+		header('Location: ring_groups.php'.($query_string ? '?'.$query_string : ''));
 		exit;
 	}
 
-//get order and order by
-	$order_by = $_GET["order_by"] ?? 'ring_group_name';
-	$order = $_GET["order"] ?? 'asc';
-	$sort = $order_by == 'ring_group_extension' ? 'natural' : null;
-
-//add the search term
-	if (isset($_GET["search"])) {
-		$search = strtolower($_GET["search"]);
-	}
-
 //get total domain ring group count
 	$sql = "select count(ring_group_uuid) from v_ring_groups ";
 	$sql .= "where domain_uuid = :domain_uuid ";
@@ -132,18 +142,15 @@
 		$sql .= "or lower(ring_group_description) like :search ";
 		$sql .= "or lower(ring_group_strategy) like :search ";
 		$sql .= ") ";
-		$parameters['search'] = '%'.$search.'%';
+		$parameters['search'] = '%'.lower_case($search).'%';
 	}
 	$num_rows = $database->select($sql, $parameters, 'column');
 	unset($sql, $parameters);
 
 //prepare to page the results
 	$rows_per_page = $settings->get('domain', 'paging', 50);
-	$param = $search ? "&search=".$search : null;
-	$param = ($show == "all" && permission_exists('ring_group_all')) ? "&show=all" : null;
-	$page = isset($_GET['page']) ? $_GET['page'] : 0;
-	list($paging_controls, $rows_per_page) = paging($num_rows, $param, $rows_per_page);
-	list($paging_controls_mini, $rows_per_page) = paging($num_rows, $param, $rows_per_page, true);
+	list($paging_controls, $rows_per_page) = paging($num_rows, $query_string, $rows_per_page);
+	list($paging_controls_mini, $rows_per_page) = paging($num_rows, $query_string, $rows_per_page, true);
 	$offset = $rows_per_page * $page;
 
 //get the list
@@ -177,7 +184,7 @@
 		$sql .= "or lower(ring_group_description) like :search ";
 		$sql .= "or lower(ring_group_strategy) like :search ";
 		$sql .= ") ";
-		$parameters['search'] = '%'.$search.'%';
+		$parameters['search'] = '%'.lower_case($search).'%';
 	}
 	$sql .= order_by($order_by, $order, null, null, $sort);
 	$sql .= limit_offset($rows_per_page, $offset);
@@ -197,7 +204,7 @@
 	echo "	<div class='heading'><b>".$text['title-ring_groups']."</b><div class='count'>".number_format($num_rows)."</div></div>\n";
 	echo "	<div class='actions'>\n";
 	if (permission_exists('ring_group_add')) {
-		echo button::create(['type'=>'button','label'=>$text['button-add'],'icon'=>$settings->get('theme', 'button_icon_add'),'id'=>'btn_add','link'=>'ring_group_edit.php']);
+		echo button::create(['type'=>'button','label'=>$text['button-add'],'icon'=>$settings->get('theme', 'button_icon_add'),'id'=>'btn_add','link'=>'ring_group_edit.php'.($query_string ? '?'.$query_string : '')]);
 	}
 	if (permission_exists('ring_group_add') && $ring_groups) {
 		echo button::create(['type'=>'button','label'=>$text['button-copy'],'icon'=>$settings->get('theme', 'button_icon_copy'),'id'=>'btn_copy','name'=>'btn_copy','style'=>'display: none;','onclick'=>"modal_open('modal-copy','btn_copy');"]);
@@ -208,20 +215,20 @@
 	if (permission_exists('ring_group_delete') && $ring_groups) {
 		echo button::create(['type'=>'button','label'=>$text['button-delete'],'icon'=>$settings->get('theme', 'button_icon_delete'),'id'=>'btn_delete','name'=>'btn_delete','style'=>'display: none;','onclick'=>"modal_open('modal-delete','btn_delete');"]);
 	}
-	echo 		"<form id='form_search' class='inline' method='get'>\n";
-	if (permission_exists('ring_group_all')) {
-		if ($show == 'all') {
-			echo "		<input type='hidden' name='show' value='all'>";
-		}
-		else {
-			echo button::create(['type'=>'button','label'=>$text['button-show_all'],'icon'=>$settings->get('theme', 'button_icon_all'),'link'=>'?show=all']);
+	echo "		<form id='form_search' class='inline' method='get'>\n";
+	foreach ($param as $key => $value) {
+		if ($key !== 'search' && $key !== 'page') {
+			echo "		<input type='hidden' name='".escape($key)."' value='".escape($value)."'>\n";
 		}
 	}
-	echo 		"<input type='text' class='txt list-search' name='search' id='search' value=\"".escape($search)."\" placeholder=\"".$text['label-search']."\" onkeydown=''>";
+	if ($show !== 'all' && permission_exists('ring_group_all')) {
+		echo button::create(['type'=>'button','label'=>$text['button-show_all'],'icon'=>$settings->get('theme', 'button_icon_all'),'link'=>'?show=all']);
+	}
+	echo "		<input type='text' class='txt list-search' name='search' id='search' value=\"".escape($search)."\" placeholder=\"".$text['label-search']."\" onkeydown=''>";
 	echo button::create(['label'=>$text['button-search'],'icon'=>$settings->get('theme', 'button_icon_search'),'type'=>'submit','id'=>'btn_search']);
 	//echo button::create(['label'=>$text['button-reset'],'icon'=>$settings->get('theme', 'button_icon_reset'),'type'=>'button','id'=>'btn_reset','link'=>'ring_groups.php','style'=>($search == '' ? 'display: none;' : null)]);
 	if ($paging_controls_mini != '') {
-		echo 	"<span style='margin-left: 15px;'>".$paging_controls_mini."</span>";
+		echo "	<span style='margin-left: 15px;'>".$paging_controls_mini."</span>";
 	}
 	echo "		</form>\n";
 	echo "	</div>\n";
@@ -243,7 +250,6 @@
 
 	echo "<form id='form_list' method='post'>\n";
 	echo "<input type='hidden' id='action' name='action' value=''>\n";
-	echo "<input type='hidden' name='search' value=\"".escape($search)."\">\n";
 
 	echo "<div class='card'>\n";
 	echo "<table class='list'>\n";
@@ -254,14 +260,14 @@
 		echo "	</th>\n";
 	}
 	if ($show == "all" && permission_exists('ring_group_all')) {
-		echo th_order_by('domain_name', $text['label-domain'], $order_by, $order);
+		echo th_order_by('domain_name', $text['label-domain'], $order_by, $order, null, null, $query_string);
 	}
-	echo th_order_by('ring_group_name', $text['label-name'], $order_by, $order);
-	echo th_order_by('ring_group_extension', $text['label-extension'], $order_by, $order);
-	echo th_order_by('ring_group_strategy', $text['label-strategy'], $order_by, $order);
-	echo th_order_by('ring_group_forward_enabled', $text['label-forwarding'], $order_by, $order);
-	echo th_order_by('ring_group_enabled', $text['label-enabled'], $order_by, $order, null, "class='center'");
-	echo th_order_by('ring_group_description', $text['header-description'], $order_by, $order, null, "class='hide-sm-dn'");
+	echo th_order_by('ring_group_name', $text['label-name'], $order_by, $order, null, null, $query_string);
+	echo th_order_by('ring_group_extension', $text['label-extension'], $order_by, $order, null, null, $query_string);
+	echo th_order_by('ring_group_strategy', $text['label-strategy'], $order_by, $order, null, null, $query_string);
+	echo th_order_by('ring_group_forward_enabled', $text['label-forwarding'], $order_by, $order, null, null, $query_string);
+	echo th_order_by('ring_group_enabled', $text['label-enabled'], $order_by, $order, null, "class='center'", $query_string);
+	echo th_order_by('ring_group_description', $text['header-description'], $order_by, $order, null, "class='hide-sm-dn'", $query_string);
 	if (permission_exists('ring_group_edit') && $settings->get('theme', 'list_row_edit_button', false)) {
 		echo "	<td class='action-button'>&nbsp;</td>\n";
 	}
@@ -272,7 +278,7 @@
 		foreach ($ring_groups as $row) {
 			$list_row_url = '';
 			if (permission_exists('ring_group_edit')) {
-				$list_row_url = "ring_group_edit.php?id=".urlencode($row['ring_group_uuid']);
+				$list_row_url = "ring_group_edit.php?id=".urlencode($row['ring_group_uuid']).($query_string ? '&'.$query_string : '');
 				if ($row['domain_uuid'] != $_SESSION['domain_uuid'] && permission_exists('domain_select')) {
 					$list_row_url .= '&domain_uuid='.urlencode($row['domain_uuid']).'&domain_change=true';
 				}