# Grandstream Device Management System (GDMS)

- [How to login to the GDMS platform](/support/services/voice-over-ip-voip/technical-references/grandstream-management-portal/how-to-login-to-the-gdms-platform.md): This is article covers how to log in using your GDMS account
- [How to run diagnostic tests within the GDMS](/support/services/voice-over-ip-voip/technical-references/grandstream-management-portal/how-to-run-diagnostics-on-phone-in-gdms.md): This article runs through some of the diagnostic capabilities of the Grandstream Device Management System and how to access them.
- [How to add a site and move a VoIP Device into it](/support/services/voice-over-ip-voip/technical-references/grandstream-management-portal/how-to-add-a-site-and-move-a-phone-into-it.md): This article goes over how you can add a site to the GDMS platform and move a VoIP device into it, essentially associating it with a customer
- [How do I add/remove users from the GDMS Portal?](/support/services/voice-over-ip-voip/technical-references/grandstream-management-portal/how-to-get-a-new-user-added-to-the-portal.md): This article covers how partners can give additional users access to the GDMS to manage the phones and carry out troubleshooting