diff --git a/app/extensions/extensions.php b/app/extensions/extensions.php
index 7e337a2c5b..98ff83cf93 100644
--- a/app/extensions/extensions.php
+++ b/app/extensions/extensions.php
@@ -206,22 +206,31 @@
 			echo "	<td valign='top' class='".$row_style[$c]."'>".$row['user_context']."</td>\n";
 
 			if (permission_exists('extension_registered')) {
- 				echo "	<td valign='top' class='".$row_style[$c]."'>";
- 				$found = false;
- 				$found_count = 0;
- 				foreach ($registrations as $arr) {
- 					if (in_array($row['extension'].'@'.$_SESSION['domain_name'],$arr)) {
- 						$found = true;
- 						$found_count++;
- 					}
- 				}
- 				if ($found) {
- 					echo "Yes ($found_count)";
- 				} else {
- 					echo "No";
- 				}
- 				echo "&nbsp;</td>\n";
- 			}
+				echo "	<td valign='top' class='".$row_style[$c]."'>";
+				$extension_number = $row['extension'].'@'.$_SESSION['domain_name'];
+				$extension_number_alias = $row['number_alias'];
+				if(strlen($extension_number_alias) > 0) {
+					$extension_number_alias .= '@'.$_SESSION['domain_name'];
+				}
+				$found_count = 0;
+				foreach ($registrations as $arr) {
+					if(
+						($extension_number == $arr['user']) ||
+						($extension_number_alias != '' &&
+							$extension_number_alias == $arr['user']
+						)
+					){
+						$found_count++;
+					}
+				}
+				if ($found_count > 0) {
+					echo "Yes ($found_count)";
+				} else {
+					echo "No";
+				}
+				unset($extension_number, $extension_number_alias, $found_count, $arr);
+				echo "&nbsp;</td>\n";
+			}
 
 			echo "	<td valign='top' class='".$row_style[$c]."'>".ucwords($row['enabled'])."</td>\n";
 			echo "	<td valign='top' class='row_stylebg' width='30%'>".$row['description']."&nbsp;</td>\n";