CIX Network Address Translation (NAT)

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The Strata CIX supports the use of IP telephones that are behind NAT firewalls. NAT allows multiple devices, such as personal computers and IP telephones to share a single public IP address. This is very common in home and small office broadband networks. A Strata CIX in the main office is able to support IP telephones at remote offices that are behind broadband routers and not connected by VPN – something not supported by some VoIP vendors. Of course using a VPN is more secure, but there may be instances where it is not practical. If you would like to support a mix of devices on the private network, and devices on the public network, see the guidelines below.

NAT Firewall Guidelines

The use of a firewall between the Strata CIX, LAN or Media Application Server and the Public Internet is highly recommended. However, the use of some firewalls or routers with NAT requires proper configuration to avoid problems with IPTs registered to an MIPU / LIPU card.

NAT General Guidelines

The following are general guide lines for successful IPT configuration.

•All MIPU / LIPU / GIPU and GIPH cards must have a Public IP Address if there are any public network IPTs. This allows the MIPU / LIPU and GIPU / GIPH to resolve the NAT translated IP addresses of both IPTs involved in the call.

This also allows you to configure an IP phone or soft IPT to work on the LAN and have the same configuration work when you take the phone or laptop to another network.

•There must not be more than one NAT router between an IPT and the internet.
•The MIPU / LIPU and GIPU / GIPH must have a Gateway Address assigned.
•The MIPU / LIPU and GIPU / GIPH should be connected to the public network, through a firewall. The firewall should use a one-to-one NAT to give the MIPU / LIPU and GIPU / GIPH the same IP address on the public side and the safe side of the firewall.
•The MIPU / LIPU and GIPU / GIPH can not be located ‘behind’ a NAT (given a private IP address). However, it can, and should be behind a firewall.

NAT Router Guidelines

There are three types of NAT routers available at this time.

•Full Cone — These are compatible with Strata CIX and Strata Net IP configurations.
•Partial/Restricted Cone — These are compatible with Strata CIX and Strata Net IP configurations.
•Symmetric — At this time these routers may cause unreliable service or cause unwanted symptoms. These routers are not compatible with Strata CIX and Strata Net IP configurations.

 

Remote Stations

Figure 23        IP Telephony Configurations Using NAT Routers

 

 


























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