Togo Cell and Shanghai Sunstar has signed an agreement to upgrade its CNSOS (Network Signalling Optimizing System) to support VoLTE services. Sunstar started to help Togo Cell setup CNSOS in 2014 and is continuously helping to optimize the entire telecom network infrastructure of Togo Cell  by monitoring its signalling links and make informed decisions by smart analytic of the huge amount of data generated and collected from the network to better support voice, data and multimedia services.