Importation of used network switches

Hi,
We have recently registered a company in Serbia. We are in the process of opening a physical office, we have signed a lease agreement already.
We have some spare Cisco network switches in our office and wish to use them in our Serbia office.

Does anyone know the import process for used electrical equipment? All the importers and customs agents I speak to just say its very difficult but do not provide any further information.

Any input gratefully received.

Regards|
Tim