ZyXEL USG110/210/310 User Guide - Page 455
Peer-to-Peer Calls and the Zyxel Device, VoIP Calls from the WAN with Multiple Outgoing Calls, VoIP
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Chapter 15 ALG • You do not need to use TURN (Traversal Using Relay NAT) for VoIP devices behind the Zyxel Device when you enable the SIP ALG. • Configuring the SIP ALG to use custom port numbers for SIP traffic also configures the application patrol (see Chapter 36 on page 689) to use the same port numbers for SIP traffic. Likewise, configuring the application patrol to use custom port numbers for SIP traffic also configures SIP ALG to use the same port numbers for SIP traffic. Peer-to-Peer Calls and the Zyxel Device The Zyxel Device ALG can allow peer-to-peer VoIP calls for both H.323 and SIP. You must configure the security policy and NAT (port forwarding) to allow incoming (peer-to-peer) calls from the WAN to a private IP address on the LAN (or DMZ). VoIP Calls from the WAN with Multiple Outgoing Calls When you configure the security policy and NAT (port forwarding) to allow calls from the WAN to a specific IP address on the LAN, you can also use policy routing to have H.323 (or SIP) calls from other LAN or DMZ IP addresses go out through a different WAN IP address. The policy routing lets the Zyxel Device correctly forward the return traffic for the calls initiated from the LAN IP addresses. For example, you configure the security policy and NAT to allow LAN IP address A to receive calls from the Internet through WAN IP address 1. You also use a policy route to have LAN IP address A make calls out through WAN IP address 1. Configure another policy route to have H.323 (or SIP) calls from LAN IP addresses B and C go out through WAN IP address 2. Even though only LAN IP address A can receive incoming calls from the Internet, LAN IP addresses B and C can still make calls out to the Internet. Figure 316 VoIP Calls from the WAN with Multiple Outgoing Calls VoIP with Multiple WAN IP Addresses With multiple WAN IP addresses on the Zyxel Device, you can configure different security policy and NAT (port forwarding) rules to allow incoming calls from each WAN IP address to go to a specific IP address on the LAN (or DMZ). Use policy routing to have the H.323 (or SIP) calls from each of those LAN or DMZ IP addresses go out through the same WAN IP address that calls come in on. The policy routing lets the Zyxel Device correctly forward the return traffic for the calls initiated from the LAN IP addresses. For example, you configure security policy and NAT rules to allow LAN IP address A to receive calls through public WAN IP address 1. You configure different security policy and port forwarding rules to allow LAN IP address B to receive calls through public WAN IP address 2. You configure corresponding ZyWALL USG Series User's Guide 455
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