diff --git a/app/fax_queue/resources/job/fax_send.php b/app/fax_queue/resources/job/fax_send.php
index 935f114c9e..6f8421cfb7 100644
--- a/app/fax_queue/resources/job/fax_send.php
+++ b/app/fax_queue/resources/job/fax_send.php
@@ -406,9 +406,10 @@
 			$dial_string .= "fax_uri="             . $fax_uri  . ",";
 			$dial_string .= "fax_retry_attempts="  . $fax_retry_count  . ",";  
 			$dial_string .= "fax_retry_limit="     . $retry_limit  . ",";
-			//$dial_string .= "fax_retry_sleep=180"  . ",";
-			$dial_string .= "fax_verbose=true"     . ",";
-			//$dial_string .= "fax_use_ecm=off"      . ",";
+			//$dial_string .= "fax_retry_sleep=180,";
+			$dial_string .= "fax_verbose=true,";
+			//$dial_string .= "fax_use_ecm=off,";
+			$dial_string .= "absolute_codec_string=PCMU,PCMA,";
 			$dial_string .= "api_hangup_hook='lua app/fax/resources/scripts/hangup_tx.lua'";
 			$fax_command  = "originate {" . $dial_string . "}" . $fax_uri." &txfax('".$fax_file."')";
 			//echo $fax_command."\n";