Peter Downes wrote :
> Can anybody recommend a SIP aware ADSL router that will allow VoIP traffic
> to and from the private internal network?

The VoIP firmware that can be had here
<http://www.dd-wrt.com/dd-wrtv2/downloads.php> is excellent.

Have a look at the docs to see which routers you can use it with. Pay
particular attention to model numbers & version numbers, though - the
newer Linksys models in most UK shops don't have enough memory to
support the third party firmware.