/ http://www.slideshare.net/images/logo.gif / 際際滷Share feed for 際際滷shows by User: KarenKhachatryan1 https://cdn.slidesharecdn.com/profile-photo-KarenKhachatryan1-48x48.jpg?cb=1523518419 Operation, maintenance and configuration of mobile core network (MSC/VLR/HLR/BSC/RNC/SGSN/GGSN) and 2G/3G radio network