Added new configurable block for demapping of control channels.
diff --git a/grc/CMakeLists.txt b/grc/CMakeLists.txt
index ef06807..d1628cc 100644
--- a/grc/CMakeLists.txt
+++ b/grc/CMakeLists.txt
@@ -25,6 +25,7 @@
     receiver/gsm_sch_detector.xml
     receiver/gsm_fcch_detector.xml
     demapping/gsm_get_bcch_or_ccch_bursts.xml
+    demapping/gsm_universal_ctrl_chans_demapper.xml 
     decoding/gsm_control_channels_decoder.xml
     misc_utils/gsm_extract_system_info.xml
     misc_utils/gsm_controlled_rotator_cc.xml
diff --git a/grc/demapping/gsm_universal_ctrl_chans_demapper.xml b/grc/demapping/gsm_universal_ctrl_chans_demapper.xml
new file mode 100644
index 0000000..48b0f83
--- /dev/null
+++ b/grc/demapping/gsm_universal_ctrl_chans_demapper.xml
@@ -0,0 +1,32 @@
+<?xml version="1.0"?>
+<block>
+  <name>Universal ctrl chans demapper</name>
+  <key>gsm_universal_ctrl_chans_demapper</key>
+  <import>import gsm</import>
+  <make>gsm.universal_ctrl_chans_demapper($starts_fn_mod51, $channel_types)</make>
+
+  <param>
+    <name>starts_fn_mod51</name>
+    <key>starts_fn_mod51</key>
+    <value>[2,6,12,16,22,26,32,36,42,46]</value>
+    <type>int_vector</type>
+    <hide>part</hide>
+  </param>
+
+  <param>
+    <name>channel_types</name>
+    <key>channel_types</key>
+    <value>[1,2,2,2,2,2,2,2,2,2]</value>
+    <type>int_vector</type>
+    <hide>part</hide>
+  </param>
+
+  <sink>
+    <name>bursts</name>
+    <type>message</type>
+  </sink>
+  <source>
+    <name>bursts</name>
+    <type>message</type>
+  </source>
+</block>
diff --git a/grc/gsm_block_tree.xml b/grc/gsm_block_tree.xml
index 789932a..df463b2 100644
--- a/grc/gsm_block_tree.xml
+++ b/grc/gsm_block_tree.xml
@@ -22,6 +22,7 @@
     <cat>
       <name>Logical channels demapping</name>
       <block>gsm_get_bcch_or_ccch_bursts</block>
+      <block>gsm_universal_ctrl_chans_demapper</block>
     </cat>
     <cat>
       <name>Decoding</name>