diff --git a/app/fax/fax_send.php b/app/fax/fax_send.php
index cbd205bb87..e134e37bbe 100644
--- a/app/fax/fax_send.php
+++ b/app/fax/fax_send.php
@@ -608,7 +608,7 @@ function gs_cmd($args) {
 					$fax_uri = $route_array[0];
 					$t38 = "fax_enable_t38=true,fax_enable_t38_request=true,";
 				}
-				$cmd = "api originate {for_fax=1,absolute_codec_string='PCMU,PCMA',accountcode='".$fax_accountcode."',sip_h_X-accountcode='".$fax_accountcode."',domain_uuid=".$_SESSION["domain_uuid"].",domain_name=".$_SESSION["domain_name"].",mailto_address='".$mailto_address."',mailfrom_address='".$mailfrom_address."',origination_caller_id_name='".$fax_caller_id_name."',origination_caller_id_number='".$fax_caller_id_number."',fax_ident='".$fax_caller_id_number."',fax_header='".$fax_caller_id_name."',fax_uri=".$fax_uri.",fax_file='".$fax_file."',fax_retry_attempts=1,fax_retry_limit=20,fax_retry_sleep=180,fax_verbose=true,fax_use_ecm=off,".$t38."api_hangup_hook='lua fax_retry.lua'}".$fax_uri." &txfax('".$fax_file."')";
+				$cmd = "api originate {for_fax=1,accountcode='".$fax_accountcode."',sip_h_X-accountcode='".$fax_accountcode."',domain_uuid=".$_SESSION["domain_uuid"].",domain_name=".$_SESSION["domain_name"].",mailto_address='".$mailto_address."',mailfrom_address='".$mailfrom_address."',origination_caller_id_name='".$fax_caller_id_name."',origination_caller_id_number='".$fax_caller_id_number."',fax_ident='".$fax_caller_id_number."',fax_header='".$fax_caller_id_name."',fax_uri=".$fax_uri.",fax_file='".$fax_file."',fax_retry_attempts=1,fax_retry_limit=20,fax_retry_sleep=180,fax_verbose=true,fax_use_ecm=off,".$t38."api_hangup_hook='lua fax_retry.lua'}".$fax_uri." &txfax('".$fax_file."')";
 				//send the command to event socket
 				$response = event_socket_request($fp, $cmd);
 				$response = str_replace("\n", "", $response);