Is it legal for Xiamen social security contributions to be the same as abroad

In Xiamen is not the only place where you can enroll in social security with a local household registration, but you can also pay social security with a foreign household registration. The foreign household registration can't go to the social security bureau personally to do social security, but through the social security payment company to participate in the insurance. Nowadays, the social security for the national network, social security nationwide, so Xiamen social security contributions with the field as legal.