diff --git a/docs/Dependencies.txt b/docs/Dependencies.txt
index 9f315706..01440056 100644
--- a/docs/Dependencies.txt
+++ b/docs/Dependencies.txt
@@ -1,77 +1,83 @@
 
 SIP SIMPLE client SDK dependencies
 ----------------------------------
 
 Home page: http://sipsimpleclient.org
 
 SIP SIMPLE SDK depends upon the following third party C sources:
 
 - PJSIP base revision 210 from 2020-02-14
   https://github.com/pjsip/pjproject/archive/2.10.tar.gz
 
 - ZRTP tag 6b3cd8e6783642292bad0c21e3e5e5ce45ff3e03
   https://github.com/wernerd/ZRTPCPP.git
 
 Fetch and patch the dependencies using get_dependencies.sh script
 
 
 AMR codec
 ---------
 
+See codecs note below.
+
 Narrow-band
 
    Install opencore-amr using apt-get on Debian/Ubuntu
 
    On Mac:
 
    brew install opencore-amr
 
    Add to shell environment:
 
    export SIPSIMPLE_AMR_NB_PATH="/usr/local/opt/opencore-amr"
 
 Wide-band
 
 Source code: https://sourceforge.net/projects/opencore-amr/files/vo-amrwbenc
 
 A copy of the tree is included in ./deps/vo-amrwbenc-0.1.3 folder.
 
 cd ./deps/vo-amrwbenc-0.1.3/
  
 On Mac:
 
      ./configure --prefix=/usr/local/opt/vo-amrwbenc
      make 
      sudo make install
 
      Add to shell environment:
 
      export SIPSIMPLE_AMR_WB_PATH="/usr/local/opt/vo-amrwbenc"
 
 On Linux:
 
      ./configure --prefix=/usr/local/
      make 
      sudo make install
 
 
-In ./sipsimple/configuration/settings.py add the AMR codecs to audio_codec_list:
-
-    default=AudioCodecList(('opus', 'G722', 'PCMU', 'PCMA', 'speex', 'iLBC', 'GSM', 'AMR-WB')))
-
-
 Python dependencies available from AG Projects repositories:
 
  * python3-application      http://download.ag-projects.com/SipSimpleSDK/Python3/ 
  * python3-eventlib         http://download.ag-projects.com/SipSimpleSDK/Python3/ 
  * python3-gnutls           http://download.ag-projects.com/SipSimpleSDK/Python3/
  * python3-otr              http://download.ag-projects.com/SipSimpleSDK/Python3/
  * python3-msrplib          http://download.ag-projects.com/SipSimpleSDK/Python3/
  * python3-xcaplib          http://download.ag-projects.com/SipSimpleSDK/Python3/
 
 The dependencies for each package can be found inside debian/control file
 
 On a Debian or Ubuntu based system you can install their dependencies using:
 
 sudo mk-build-deps --install debian/control
 
+
+Codecs note
+-----------
+
+Depending on what codecs have been compiled, one needs to modify in place:
+
+AudioCodecList inside sipsimple/configuration/datatypes.py
+RTPSettings inside sipsimple/configuration/setting.py
+