diff --git a/app/switch/resources/scripts/app/ring_groups/index.lua b/app/switch/resources/scripts/app/ring_groups/index.lua
index 42324450a7..e4dd3bfa6b 100644
--- a/app/switch/resources/scripts/app/ring_groups/index.lua
+++ b/app/switch/resources/scripts/app/ring_groups/index.lua
@@ -306,14 +306,40 @@ log = require "resources.functions.log".ring_group
 --call screen enabled
 	if (ring_group_call_screen_enabled == 'true') then
 
+		--local codecs = session:getVariable("codec_string")
+		local codecs = session:getVariable("rtp_use_codec_string");
+
+		--put the codecs into an array
+		local codec_array = explode(",",codecs);
+
+		--exclude video codecs and resave the new list to a string
+		local new_codec_array = {}
+		for index, value in ipairs(codec_array) do
+			if (value ~= "H264" and value ~= 'VP8') then
+				table.insert(new_codec_array, value)
+			end
+		end
+		local new_codecs = table.concat(new_codec_array, ",");
+
+		--set a new allowed codec string
+		session:setVariable("absolute_codec_string", new_codecs);
+
+		--callback function detecting dtmf
+		function on_dtmf(s, _type, obj, arg)
+			local k, v = nil, nil
+			if (_type == "dtmf") then
+				dtmf_entered = 1;
+				return 'break'
+			else
+				return ''
+			end
+		end
+
 		--answer the call if not answered
 		if (not session_answer) then
 			session:answer();
 		end
 
-		--flush dtmf digits from the input buffer
-		session:flushDigits();
-
 		--set the variables
 		min_digits = 1;
 		max_digits = 1;
@@ -328,8 +354,8 @@ log = require "resources.functions.log".ring_group
 
 		--recording settings
 		max_length_seconds = 30;
-		silence_threshold = 30;
-		silence_seconds = 3;
+		silence_threshold = settings:get('recordings', 'recording_silence_threshold', 'numeric') or 200;
+		silence_seconds = settings:get('recordings', 'recording_silence_seconds', 'numeric') or 3;
 
 		--create the call scree file name
 		call_sreen_name = 'call_screen.'..uuid..'.'..record_ext;
@@ -339,10 +365,12 @@ log = require "resources.functions.log".ring_group
 			mkdir(record_path);
 		end
 
+		--set callback function for when a caller sends DTMF
+		session:setInputCallback('on_dtmf', '');
+
 		--record the name and reason for calling
 		if (session:ready()) then
 			result = session:recordFile(record_path..'/'..call_sreen_name, max_length_seconds, silence_threshold, silence_seconds);
-			--session:execute("record", record_path..'/'..call_sreen_name.." 180 200");
 		end
 	end