Avaya IP Line User Manual download pdf (Page 63)

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Features Page 63 of 770

IP Line Description, Installation, and Operation

Mapping

When an IP Phone is used in a private network behind a NAT device, the

NAT router strips the IP Phone’s private IP address and private port number

and assigns it a public IP address and public port number.

To support multiple IP Phones behind one NAT device, it is necessary for

NAT to map between public and private IP addresses, and ports for each IP

Phone behind it. There is a mapping for both a signaling port and a media

(voice) port.

Placing an IP Phone behind Multiple NAT devices is an unsupported

configuration. If it is necessary to have a configuration with multiple NATs

between the IP Phone and the Voice Gateway Media Card, all NATs on the

path must follow the rules described in the following sections for signaling

and media streams.

Mapping is configured and implemented using the NAT device. The IP Line

application does not implement any of the mappings.

NAT and signaling

NAT hides the true identity of the IP Phone from the LTPS. The LTPS is only

aware of any IP Phone based on the public IP address and port of the signaling

messages. A signaling message originates from the IP Phone on the private

side from port 5000. That signaling message is then mapped from the private

side to a public IP and port and that is the IP address seen by the LTPS.

Signaling messages between the Voice Gateway Media Card and IP Phones

are carried by RUDP. Each RUDP connection is distinguished by its IP

address and port number.

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Avaya IP Line User Manual Page 63

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