Trondheim municipality, hereafter called the Contracting Authority, invites tenderers to a negotiated procedure for a contract for network operation and communication services for the Contracting Authority's units, as well as the procurement of network equipment and maintenance of the Contracting Authority's network equipment. The agreement also includes licences connected to the network equipment. The contracting authority has chosen a contract model where the tenderer shall provide network operation and communication as a combined service. Tenderers shall have uniform delivery, integration and follow-up responsibility for all of the service components, including any sub-suppliers of communication services. At the same time, the contract shall facilitate competition between suppliers of connections, economic transparency, technological flexibility and an effective transition to the new supplier at the end of the contract. The competition starts with a prequalification of tenderers who have submitted a request for participation in the competition. Tenderers who are qualified will be invited to submit a tender by replying to this tender documentation and annexes. See chapter 4 Rules for implementation of the competition for further information on the implementation of the prequalification and tender phase.