Configuration: (as per JR 6/11/2024)
To allow application-level inspection and NAT of the SIP protocol:
- Go to Users & Objects > Services.
- Edit the SIP_UDP and SIP_TCP built in services by enabling SIP inspection on both services - Clear the Disable inspection for this service checkbox in each service object. For more details, see Viewing System Information.
- To allow the SIP server to connect to internal phones from the Internet:
- Go to Access Policy > Policy.
- Add a rule to the Incoming, Internal and VPN traffic Rule Base that allows SIP traffic.
- Source - A network object that holds the IP address of the SIP server.
- Destination - A network object that holds the IP addresses of the phones behind the gateway
- Service - SIP
- Action - Accept
- For more information, see Working with the Firewall Access Policy.
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