Provide software and telephone support for technical developments related to Huawei/Ericsson/Nokia antenna (2G/4G/5G) stations ordered by Deutsche Telekom, including administration of related incoming calls and changes. The job also includes telephone liaison with the on-site contractor, supporting information exchange between on-site technicians and professional groups, and checking and taking over Huawei, Ericsson and Nokia system-equipped antenna replacements.