Towards a methodology to define Service Level Agreements in a convergent network scenario

Service Level Agreement (SLA) is a written contract between a service provider and client to set the level agreed for the quality of service. Basically defines the relationship between two parties: the supplier and customer. An SLA defines and identifies customer needs at the same time controlling their expectations of service in relation to the ability of the supplier, provides a framework of understanding, simplifies complicated issues, reduce areas of conflict and encourages dialogue with the dispute. However, if it is considered scenario in which combines different networks in a convergent environment with mobility (integrating SIP and Mobile IP) is required to undertake a study to identify the QoE and QoS parameters that must be evaluated in order to maintain SLA agreed between the supplier and customer. This paper shows review of the current environment of telecommunications, the development of IMS and mobile environments by proposing the development of a project that seeks the identification and definition of the most important technical and economical factors to be considered in a interoperability scenario, in order to define a Service Level Agreement (SLA) that supports the required QoS and QoE in the interconnection between a fixed and nobile networks using MIP and SIP protocols.