Outbound NAT proxy vs NAT of ports to each device


I am just about to set-up 4 Cisco 7940's to use with our voipfone accounts and had a few general questions before I get started. We have a 20mb NTL: Telewest business DSL line and plan to put in place elements of CoS and QoS where needed on the network.

1) Should we use outbound nat proxy or attempt to NAT the ports pro's / con's
2) Will the latency be higher if an outbound proxy is used vs NAT of ports
3) If we NAT the ports do we then need a public ip for each handset or can port translation or another method be used

Hope this is enough details this is really just general theory so is not device specific, the kit being used is likely to be a Cisco 2801 for those interested.

All comments and advice welcome :)


Re: Outbound NAT proxy vs NAT of ports to each device

In most situations the best way to set QoS is to set priority to -

The NAT proxy is not required to be used in most situations. It depends on the router you're using generally.

I believe the Cisco phones often need the outbound proxy to be used though.

It won't add any latency if used.

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