ring-android/app/src/main/res/xml/account_sdes.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
Copyright (C) 2004-2014 Savoir-Faire Linux Inc.                     
                                                                    
Author: Alexandre Lision <alexandre.lision@savoirfairelinux.com>                   
                                                                    
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or   
(at your option) any later version.                                 
                                                                    
This program is distributed in the hope that it will be useful,     
but WITHOUT ANY WARRANTY; without even the implied warranty of      
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the       
GNU General Public License for more details.                        
                                                                    
You should have received a copy of the GNU General Public License   
along with this program; if not, write to the Free Software         
 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.          
                                                                    
Additional permission under GNU GPL version 3 section 7:            
                                                                    
If you modify this program, or any covered work, by linking or      
combining it with the OpenSSL project's OpenSSL library (or a       
modified version of that library), containing parts covered by the  
terms of the OpenSSL or SSLeay licenses, Savoir-Faire Linux Inc.    
grants you additional permission to convey the resulting work.      
Corresponding Source for a non-source form of such a combination    
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-->

<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >

    <CheckBoxPreference
        android:id="@+id/account_creation_srtp_rtp_fallback"
        android:key="SRTP.rtpFallback"
        android:persistent="false"
        android:title="@string/account_srtp_fallback_label" />

</PreferenceScreen>