Operators negotiate agreements among themselves in respect of technical and commercial modalities of access and interconnection. These agreements are not made public. The Law on Electronic Communications allows the NRA to impose a transparency obligation (Article 85) and an obligation to publish an interconnection reference offer (Article 86) to undertakings with significant market power.In several of the market analysis where SMP was found the transparency obligation was imposed; note however that accounting information is confidential, most of the times. The incumbent operator is obliged to publish an interconnection reference offer (IRO) including information such as technical specifications, network characteristics, terms and conditions for supply and use, and prices; the IRO includes a model of agreement with other operators (see IRO of MEO: [https://ptwholesale.pt/en/servicos-nacionais/trafego/Pages/ori.aspx]).