Roaming Architectures in Voice over LTE services

In this thesis we consider on Architecture of Voice over Long-Term Evolution (VoLTE) in Roaming networks with special consideration on IMS (IP Multimedia Subservice) core. The IMS core network of LTE architecture contains of three main parts. SBC, CSCF and TAS. Moreover, our job is testing and End 2 End troubleshooting among test cases that the company provided. This episode is called Laboratory level to test whole the cases that are anticipated and prepared by Vodafone which will be tested in live situation and if all the acquired results are as they are expected, the project will be implemented as a new technology for the clients. We are mostly tracing on the elements of IMS by special tool having been provided by Huawei (our vendor for SBC and CSCF). As a matter of fact, we follow the IMS registration path (Signal sends from SGW to PGW, SBC, CSCF and finally TAS). If during the flow, the required parameters are lost or have wrong path, by testing and recognizing the issue, we will fix that. Moreover, for tracing on TAS, we are using the GUI with internal network that is provided by Nokia (our vendor for TAS).