Connecting Two IP Gateways
38 025-9631D.1
on the manufacturer of the router/firewall. The following table shows how external
(WAN) port accesses must be routed to internal (LAN) IP addresses.
Router/Firewall #1 Router/Firewall #2
Port Access To Address Port Access To Address
Notes
5060 192.168.0.133 5060 10.0.0.100 For SIP UDP traffic
4000 192.168.0.133 4004 10.0.0.100 For RTP UDP traffic
4001 192.168.0.133 4005 10.0.0.100 For RTCP UDP
traffic (one port
number higher than
RTP)
6060 192.168.0.133 6060 10.0.0.100 For TCP traffic
About Dynamic IP Addresses
Each RoIP Gateway is configured by the installer with a static IP address. The RoIP
Gateway does not support automatic assignment of its IP address via DHCP (Dynamic
Host Configuration Protocol). But provisions exist to allow a RoIP Gateway to connect to
a peer which resides behind a dynamically allocated router/firewall WAN IP address.
In some cases (typical of most Internet Service Providers - ISPs) WAN addresses are
dynamic rather than static meaning that they router/firewall’s WAN IP address may
change every few days. The only way to maintain a RoIP Gateway connection in such
cases is to use a URL (e.g. a www.name.com type of name) for the WAN’s IP address
which requires a Domain Name Service which translates the URL to the current IP
address. When URLs are used to reference an IP Send Address then it is necessary for the
RoIP Gateway to be configured with the IP address of a DNS (Domain Name System)
Server so that it can discover the current IP address for the destination.
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