|  | 
   | IMS-based Telepresence | 
   | Service and Media Reachability for Users over Restrictive   Firewalls | 
   | Advanced IP Interconnection of Services (IPXS) for national   interconnect | 
   | Integration of Single Sign-On (SSO) frameworks with 3GPP networks | 
   | Codec for Enhanced Voice Services | 
   | LIPA Mobility and SIPTO at the Local Network | 
   | Interworking between Mobile Operators using the Evolved Packet   System and Data Application Providers | 
   | Operator Policies for IP Interface Selection | 
   | Short Message Service (SMS) submit and delivery without MSISDN in   IMS | 
   | Security aspects of Public Warning System | 
   | Study on Alternatives to E.164 for Machine-Type Communications | 
   | Study on enhancements for Machine-Type Communications (MTC) | 
   | Study on Integration of Single Sign-On (SSO) frameworks with 3GPP   networks | 
   | Study on Continuity of Data Sessions to Local Networks | 
   | Study on non-MTC Mobile Data Applications Impacts | 
   | Study on Proximity-based Services | 
   | Study on User Plane Congestion management | 
   | Study on RAN Sharing Enhancements | 
   | Study on Multi Access PDN connectivity and IP flow Mobility | 
   | Study on IMS based Peer-to-Peer Content Distribution Services   (Stage 2) | 
   | Study on Core Network Overload solutions | 
   | Study on System Enhancements for Energy Efficiency | 
   | Study on S2a Mobility based On GTP and WLAN access to EPC | 
   | Study on Usage Monitoring Control enhancement | 
   | Study on Security aspects of Integration of Single Sign-On (SSO)   frameworks with 3GPP networks | 
   | Study on IMS Firewall Traversal | 
   | Study on Security on spoofed call detection and prevention (Stage   2) | 
   | Deleted - Study on UICC/USIM enhancements | 
 
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