Ioannis Sigalas Ioannis Sigalas is an experienced engineer in the Mobile Network Core SGSN (UMTS/GPRS) and IP technologies. Currently he is working as consultant in Hutchison 3G Austria as a PS core Enginner. Ioannis Sigalas might know Hans Vestberg CEO Ericsson, Hou Weigui CEO ZTE, Ren Zhengfei CEO Huawei, Rajeev Suri CEO NSN, Ben Verwaayen CEO Alcatel lucent, Michael Krammer CEO Orange, Scott Grout CEO Radisys, Michael Tsamaz CEO Cosmote, Veli-Matti Mattila CEO Elisa,Robert Chvatal CEO T-Mobile, Lars-Åke Norling CEO Telenor, Lars Nyberg CEO Sonera. Isigalas.com~Site InfoWhoisTrace RouteRBL Check
