Few companies from German I think that it using OpenLTE & OpenIMS & Kamailio http://www.ng-voice.com/ http://www.ng-voice.com/ http://www.corenetdynamics.com/

Few companies from German I think that it using OpenLTE & OpenIMS & Kamailio http://www.ng-voice.com/ http://www.ng-voice.com/ http://www.corenetdynamics.com/ http://www.corenetdynamics.com/ Regards