Interoperability problems in Next Generation Network protocols

The most recent major trend and development in telecoms has been a move toward next generation networks (NGN) and services model. NGN is based on a progressive evolution to end-to-end "all IP" and will have to provide the capabilities to make the creation, deployment, and management of all kinds of services possible. The NGN players, although use different terms for NGN, they share many of the same basic concepts in their visions for tomorrow's carrier infrastructure. In this paper we have introduced a pilot for interoperability basic call tests in next generation networks (NGN) and the results of that pilot deployment and testing are presented and analyzed. These results are based on test scenarios provided by four NGN vendors namely: Alcatel, Huawei, Siemens and ZTE. These vendors intended to demonstrate their solutions in a multi-vendor environment for Softswitch based NGN deployment that is suitable for class4 and class5 switches replacement. They had participated in an interoperability test environment for basic call and supplementary services.