Figure 2: Strategy - Local Subnet Only - Grandstream Networks UCM6100 Manual Manual

other. The network administrator would like to allow only devices in 192.168.40.x network to register to
this UCM6100.
2. Under UCM6100 web UI extension dialog, configure "Local Subnet Only" for "Strategy" option and
192.168.40.0 for "Local Subnet".
3. Save and Apply changes.
Now if the SIP end device is in subnet other than 192.168.40.x, e.g., 172.18.31.x subnet, the UCM6100
will not allow registration using this extension. The following figure shows the SIP device IP address is
172.18.31.17. The UCM6100 on IP 192.168.40.171 replies 404 Not Found for the registration request.
Figure 2: Strategy – Local Subnet Only
UCM6100 Security Manual Page 8 of 23