Since then by having strong technical knowledge and employing specialist personnel, Mazandaran switchboard has taken part in national projects such as steel complexes, petrochemical plants, cement factories, oil exploration and transmission pipe lines, ship building and marine industries, mines and several other projects and considering continues quality and daily progress principle, Mazandaran switchboard succeeded to achieve the ISO 9001/2000 certificate in 2003 in order to appoint the quality management system in its routine activities. Meanwhile, considering customer satisfaction theory, Mazandaran Switchboard Company could achieve to a high level of customer satisfaction.