The firewall will continue to run using the last installed security engines/signatures and the current configuration (rules, NAT, filtering settings, etc.).
If the service is not renewed, the main impact is that the device will no longer receive firewall security updates (signature updates), which can reduce protection over time as new threats appear.

Grandstream routers generally support the most common VPN types, including WireGuard, IPsec, OpenVPN, L2TP, and PPTP. Support and limits can vary by model.

Example: Some models may support these VPN types but limit you to one active VPN service/tunnel at a time (ex: GWN7062E/ET).

Tip: If you need higher VPN capacity, more flexibility, or a more “enterprise” VPN feature set, choose the GWN700x wired router series or GCC60xx series.

GCC PBX is an IP PBX software module integrated into Grandstream GCC convergence devices. It provides enterprise telephony features while running alongside routing, switching, and security services on the same platform.

The module supports Grandstream SIP endpoints, selected third-party SIP devices, software-based SIP clients, and Grandstream IP cameras (IPC devices). Device support depends on model compatibility and provisioning method.