diff --git a/install.php b/install.php
index a720b2c..253b758 100644
--- a/install.php
+++ b/install.php
@@ -341,9 +341,10 @@ function CheckSCCPManagerDBVersion()
 
 function CheckPermissions()
 {
+    global $amp_conf;
     outn("<li>" . _("Checking Filesystem Permissions") . "</li>");
-    $dst = $_SERVER['DOCUMENT_ROOT'] . '/admin/modules/sccp_manager/views';
-    if (fileowner($_SERVER['DOCUMENT_ROOT']) != fileowner($dst)) {
+    $dst = $amp_conf['AMPWEBROOT'] . '/admin/modules/sccp_manager/views';
+    if (fileowner($amp_conf['AMPWEBROOT']) != fileowner($dst)) {
         die_freepbx('Please (re-)check permissions by running "amportal chown. Installation Failed"');
     }
 }
@@ -922,16 +923,17 @@ function Setup_RealTime()
 }
 
 function addDriver($sccp_compatible) {
+    global $amp_conf;
+    global $cnf_int;
     outn("<li>" . _("Adding driver ...") . "</li>");
-    $file = $_SERVER['DOCUMENT_ROOT'] . '/admin/modules/core/functions.inc/drivers/Sccp.class.php';
+    $file = $amp_conf['AMPWEBROOT'] . '/admin/modules/core/functions.inc/drivers/Sccp.class.php';
     $contents = "<?php include '/var/www/html/admin/modules/sccp_manager/sccpManClasses/Sccp.class.php.v{$sccp_compatible}'; ?>";
     file_put_contents($file, $contents);
 
-    global $cnf_int;
     $dir = $cnf_int->get('ASTETCDIR');
     if (!file_exists("{$dir}/sccp.conf")) { // System re Config
         outn("<li>" . _("Adding default configuration file ...") . "</li>");
-        $sccpfile = file_get_contents($_SERVER['DOCUMENT_ROOT'] . '/admin/modules/sccp_manager/conf/sccp.conf');
+        $sccpfile = file_get_contents($amp_conf['AMPWEBROOT'] . '/admin/modules/sccp_manager/conf/sccp.conf');
         file_put_contents("{$dir}/sccp.conf", $sccpfile);
     }
 }
@@ -942,14 +944,15 @@ function checkTftpServer() {
     global $settingsFromDb;
     global $extconfigs;
     global $thisInstaller;
+    global $amp_conf;
     $confDir = $cnf_int->get('ASTETCDIR');
     $tftpRootPath = "";
     // put the rewrite rules into the required location
     if (file_exists("{$confDir}/sccpManagerRewrite.rules")) {
         rename("{$confDir}/sccpManagerRewrite.rules", "{$confDir}/sccpManagerRewrite.rules.bu");
     }
-    copy($_SERVER['DOCUMENT_ROOT'] . '/admin/modules/sccp_manager/conf/mappingRulesHeader',"{$confDir}/sccpManagerRewrite.rules");
-    file_put_contents("{$confDir}/sccpManagerRewrite.rules", file_get_contents($_SERVER['DOCUMENT_ROOT'] . '/admin/modules/sccp_manager/contrib/rewrite.rules'), FILE_APPEND);
+    copy($amp_conf['AMPWEBROOT'] . '/admin/modules/sccp_manager/conf/mappingRulesHeader',"{$confDir}/sccpManagerRewrite.rules");
+    file_put_contents("{$confDir}/sccpManagerRewrite.rules", file_get_contents($amp_conf['AMPWEBROOT'] . '/admin/modules/sccp_manager/contrib/rewrite.rules'), FILE_APPEND);
     file_put_contents("{$confDir}/sccpManagerRewrite.rules", "\n# Do not disable this rule - this is required by sccp_manager\nri ^(.+\.tlzz)?$ settings/\\1", FILE_APPEND);
     // TODO: add option to use external server
     $remoteFileName = ".sccp_manager_installer_probe_sentinel_temp".mt_rand(0, 9999999);
@@ -1015,6 +1018,7 @@ function cleanUpSccpSettings() {
     global $db;
     global $aminterface;
     global $sccp_compatible;
+    global $amp_conf;
 
     // Get current default settings from db
     $stmt = $db->prepare("SELECT keyword, sccpsettings.* FROM sccpsettings");
@@ -1042,9 +1046,12 @@ function cleanUpSccpSettings() {
         }
     }
     */
-
+    // TODO: It seems that DOCUMENT ROOT is not always set so maybe should switch to AMPWEBROOT.
+    // need to declare amp_conf global each time.
+    //global $amp_conf;
+    //dbug($amp_conf['AMPWEBROOT']);
     // Clean up sccpsettings to remove legacy values.
-    $xml_vars = $_SERVER['DOCUMENT_ROOT'] . "/admin/modules/sccp_manager/conf/sccpgeneral.xml.v{$sccp_compatible}";
+    $xml_vars = $amp_conf['AMPWEBROOT'] . "/admin/modules/sccp_manager/conf/sccpgeneral.xml.v{$sccp_compatible}";
     $thisInstaller->xml_data = simplexml_load_file($xml_vars);
     $thisInstaller->initVarfromXml();
     foreach ( array_diff_key($settingsFromDb,$thisInstaller->sccpvalues) as $key => $valueArray) {
diff --git a/sccpManClasses/Sccp.class.php.v433 b/sccpManClasses/Sccp.class.php.v433
index 5e135b7..931de55 100644
--- a/sccpManClasses/Sccp.class.php.v433
+++ b/sccpManClasses/Sccp.class.php.v433
@@ -228,9 +228,10 @@ class Sccp extends \FreePBX\modules\Core\Driver {
     }
 
     public function getDeviceDisplay($display, $deviceInfo, $currentComponent, $primarySection) {
+        global $amp_conf;
         $activeCodecs = array();
         // load xml data to get help from same source as rest of module
-        $xml_vars = $_SERVER['DOCUMENT_ROOT'] . '/admin/modules/sccp_manager/conf/sccpgeneral.xml.v433';
+        $xml_vars = $amp_conf['AMPWEBROOT'] . '/admin/modules/sccp_manager/conf/sccpgeneral.xml.v433';
             $this->xml_data = simplexml_load_file($xml_vars);
         // load metainfo from chan-sccp - help information if not in xml. Only load first time as static data.
         if (empty($this->sccpHelpInfo)) {
diff --git a/sccpManClasses/extconfigs.class.php b/sccpManClasses/extconfigs.class.php
index 5ad23ea..d8dd747 100644
--- a/sccpManClasses/extconfigs.class.php
+++ b/sccpManClasses/extconfigs.class.php
@@ -237,6 +237,7 @@ class extconfigs
     );
 
     public function updateTftpStructure($settingsFromDb) {
+        global $amp_conf;
         $adv_config = array('tftproot' => $settingsFromDb['tftp_path']['data'],
                           'firmware' => 'firmware',
                           'settings' => 'settings',
@@ -352,7 +353,7 @@ class extconfigs
         }
         // TODO: Need to add index.cnf, after setting defaults correctly
         if (!file_exists("{$baseConfig['tftp_templates_path']}/XMLDefault.cnf.xml_template")) {
-            $src_path = $_SERVER['DOCUMENT_ROOT'] . '/admin/modules/sccp_manager/conf/';
+            $src_path = $amp_conf['AMPWEBROOT'] . '/admin/modules/sccp_manager/conf/';
             $dst_path = "{$baseConfig["tftp_templates_path"]}/";
             foreach (glob("{$src_path}*.*_template") as $filename) {
                 copy($filename, $dst_path . basename($filename));
diff --git a/sccpManClasses/formcreate.class.php b/sccpManClasses/formcreate.class.php
index 0652bdd..cb0634a 100644
--- a/sccpManClasses/formcreate.class.php
+++ b/sccpManClasses/formcreate.class.php
@@ -630,6 +630,7 @@ class formcreate
 
     function addElementSLNA($child, $fvalues, $sccp_defaults,$npref, $installedLangs) {
     //       Input element Select SLS - System Language with add from external
+        global $amp_conf;
         $res_n =  (string)$child ->name;
         $res_id = $npref.$res_n;
         $child->value ='';
@@ -681,7 +682,7 @@ class formcreate
             <div class="row">
                 <div class="form-group">
                     <?php
-                    include($_SERVER['DOCUMENT_ROOT'] . '/admin/modules/sccp_manager/views/getFileModal.html');
+                    include($amp_conf['AMPWEBROOT'] . '/admin/modules/sccp_manager/views/getFileModal.html');
                     ?>
 
                     <div class="col-md-3">
diff --git a/sccpManTraits/bmoFunctions.php b/sccpManTraits/bmoFunctions.php
index a212910..633ad4f 100644
--- a/sccpManTraits/bmoFunctions.php
+++ b/sccpManTraits/bmoFunctions.php
@@ -138,8 +138,9 @@ trait bmoFunctions {
     }
 
     public function getRightNav($request) {
+        global $amp_conf;
         if (isset($request['tech_hardware']) && ($request['tech_hardware'] == 'cisco')) {
-            return load_view($_SERVER['DOCUMENT_ROOT'] .'/admin/modules/sccp_manager/views/hardware.rnav.php', array('request' => $request));
+            return load_view($amp_conf['AMPWEBROOT'] .'/admin/modules/sccp_manager/views/hardware.rnav.php', array('request' => $request));
         }
     }
 
diff --git a/views/advserver.model.php b/views/advserver.model.php
index f2c9751..081cebb 100644
--- a/views/advserver.model.php
+++ b/views/advserver.model.php
@@ -5,6 +5,7 @@
  * and open the template in the editor.
  */
 $requestType = 'firmware';
+global $amp_conf;
 ?>
 
 <div class="fpbx-container container-fluid">
@@ -160,7 +161,7 @@ foreach ($firmwareDir[0] as $child) {
     }
 };
 
-include($_SERVER['DOCUMENT_ROOT'] . '/admin/modules/sccp_manager/views/getFileModal.html');
+include($amp_conf['AMPWEBROOT'] . '/admin/modules/sccp_manager/views/getFileModal.html');
 
 ?>
 <div class="modal fade" id="edit_model" tabindex="-1" role="dialog" aria-labelledby="myLargeModalLabel">