diff --git a/app/provision/resources/classes/provision.php b/app/provision/resources/classes/provision.php
index 698ab374d1..22a7dcd255 100644
--- a/app/provision/resources/classes/provision.php
+++ b/app/provision/resources/classes/provision.php
@@ -22,6 +22,7 @@
 
 	Contributor(s):
 	Mark J Crane <markjcrane@fusionpbx.com>
+	Luis Daniel Lucio Quiroz <dlucio@okay.com.mx>
 */
 include "root.php";
 
@@ -466,6 +467,9 @@ include "root.php";
 					case "snom":
 						$mac = strtolower($mac);
 						break;
+					case "yealink":
+						$mac = strtolower($mac);
+						break;
 					default:
 						$mac = strtolower($mac);
 						$mac = substr($mac, 0,2).'-'.substr($mac, 2,2).'-'.substr($mac, 4,2).'-'.substr($mac, 6,2).'-'.substr($mac, 8,2).'-'.substr($mac, 10,2);
@@ -646,4 +650,4 @@ include "root.php";
 		} //end write function
 	} //end provision class
 
-?>
\ No newline at end of file
+?>