The local customs provides services.
The local customs service (sub-center) will provide some telephone services, and the specific contact number needs to be consulted with the local customs;
Data center services
Electronic port data center provides free telephone consultation service. Please use Baidu to search for the specific phone number.
Other enterprise services
There are some intermediaries around the country to provide electronic port access, consulting and other services; For specific consultation, training and other services, please use Baidu to search for "electronic port supporting services".