[MH-2300] An IP phone is connected to the MH-2300 for the LAN connection. How to connect to SIP server for communication via internet as the topology of the system is shown below:

The IP phone communicates with IP PBX via the VoIP port, and the RTP port on the MH-2300 needs to be configured to port forwarding. Please refer to the process of port forwarding below:
1. Add VoIP and RTP port to policy object->service->custom

2. Add setting to policy object->virtual server->port mapping

3. Under policy, go to "Incoming" to modify like below:

4. Under policy, go to “Outgoing” to modify and check "Port 3 (WAN2)".