Normalized and fixed htaccess

added comments explaining each rule
normalized tabbing
converted captures where not needed (note use of ?: means don't capture)
updated Yealink comment as it also covers Polycom
added missing $mac-directory.xml for Polycom
removed ^(?:.*/) as it is technically not needed, the test that showed
it was needed turned out to be invalid

.htaccess

@@ -1,26 +1,31 @@
 RewriteEngine	On
 
-RewriteRule     ^([A-Fa-f0-9]{12})(\.(xml|cfg))?$                      app/provision/index.php?mac=$1 [QSA]
-RewriteRule     ^([A-Fa-f0-9]{2}[:-][A-Fa-f0-9]{2}[:-][A-Fa-f0-9]{2}[:-][A-Fa-f0-9]{2}[:-][A-Fa-f0-9]{2}[:-][A-Fa-f0-9]{2}[:-])(\.(xml|cfg))?$     app/provision/index.php?mac=$1 [QSA]
-RewriteRule     ^(kt.*?-)([A-Fa-f0-9]{12})(\.(xml))$                   app/provision/index.php?mac=$2 [QSA]
-RewriteRule     ^(cfg)([A-Fa-f0-9]{12})(\.(xml))$                      app/provision/index.php?mac=$2 [QSA]
+# $mac or $mac.cfg/xml
+RewriteRule     ^([A-Fa-f0-9]{12})(?:\.xml|\.cfg)?$							app/provision/index.php?mac=$1 [QSA]
+# $m:a:c or $m:a:c.cfg/xml
+RewriteRule     ^((?:[A-Fa-f0-9]{2}[:-]){5}[A-Fa-f0-9]{2})(?:\.xml|\.cfg)?$	app/provision/index.php?mac=$1 [QSA]
+# kt*-$mac.xml
+RewriteRule     ^kt.*?-([A-Fa-f0-9]{12})\.xml$								app/provision/index.php?mac=$1 [QSA]
+# cfg-$mac.xml
+RewriteRule     ^cfg([A-Fa-f0-9]{12})\.xml$									app/provision/index.php?mac=$1 [QSA]
 
 #Snom m3
-RewriteRule     ^(m3/settings/)([A-Fa-f0-9]{12})(\.(cfg))?$            app/provision/index.php?mac=$2 [QSA]
+RewriteRule     ^m3/settings/([A-Fa-f0-9]{12})(?:\.cfg)?$					app/provision/index.php?mac=$1 [QSA]
 
 #Grandstream
-RewriteRule     ^(?:.*/)?provision/cfg([A-Fa-f0-9]{12})(\.(xml|cfg))?$      app/provision/?mac=$1 [QSA]
+RewriteRule     ^provision/cfg([A-Fa-f0-9]{12})(?:\.xml|\.cfg)?$			app/provision/?mac=$1 [QSA]
 
-#Yealink
-RewriteRule     ^(?:.*/)?provision/([A-Fa-f0-9]{12})(\.(xml|cfg))?$         app/provision/index.php?mac=$1 [QSA]
+#Yealink and Polycom
+RewriteRule     ^provision/([A-Fa-f0-9]{12})(?:\.xml|\.cfg)?$				app/provision/index.php?mac=$1 [QSA]
 
 #Polycom
-RewriteRule     ^(?:.*/)?provision/000000000000.cfg$                       app/provison/?mac=$1&file={$mac}.cfg [QSA]
-RewriteRule     ^(?:.*/)?provision/features.cfg$                           app/provision/?mac=$1&file=features.cfg [QSA]
-RewriteRule     ^(?:.*/)?provision/([A-Fa-f0-9]{12})-sip.cfg$              app/provision/?mac=$1&file=sip.cfg [QSA]
-RewriteRule     ^(?:.*/)?provision/([A-Fa-f0-9]{12})-phone.cfg$            app/provision/?mac=$1 [QSA]
-RewriteRule     ^(?:.*/)?provision/([A-Fa-f0-9]{12})-registration.cfg$     app/provision/?mac=$1&file={$mac}-registration.cfg [QSA]
-RewriteRule     ^(?:.*/)?provision/([A-Fa-f0-9]{12})-site.cfg$             app/provision/?mac=$1&file=site.cfg [QSA]
-RewriteRule     ^(?:.*/)?provision/([A-Fa-f0-9]{12})-web.cfg$              app/provision/?mac=$1&file=web.cfg [QSA]
+RewriteRule     ^provision/000000000000.cfg$								app/provision/?mac=$1&file={$mac}.cfg [QSA]
+RewriteRule     ^provision/features.cfg$									app/provision/?mac=$1&file=features.cfg [QSA]
+RewriteRule     ^provision/([A-Fa-f0-9]{12})-sip.cfg$						app/provision/?mac=$1&file=sip.cfg [QSA]
+RewriteRule     ^provision/([A-Fa-f0-9]{12})-phone.cfg$						app/provision/?mac=$1 [QSA]
+RewriteRule     ^provision/([A-Fa-f0-9]{12})-registration.cfg$				app/provision/?mac=$1&file={$mac}-registration.cfg [QSA]
+RewriteRule     ^provision/([A-Fa-f0-9]{12})-site.cfg$						app/provision/?mac=$1&file=site.cfg [QSA]
+RewriteRule     ^provision/([A-Fa-f0-9]{12})-web.cfg$						app/provision/?mac=$1&file=web.cfg [QSA]
+RewriteRule     ^provision/([A-Fa-f0-9]{12})-directory.xml$					app/provision/?mac=$1&file=directory.xml [QSA]
 
 Options -Indexes