1. National Telecommunication Institute (NTI),Switching Department,Cairo,Egypt
2. Université Paris Cité,Laboratory of Informatics Paris Descartes (LIPADE),Paris,France
3. University of Reims Champagne-Ardenne,Research Centre in Information and Communication Science and Technologies (CReSTIC),France
4. Institut Polytechnique de Paris,SAMOVAR Telecom SudParis,Palaiseau,France