asterisk users - Aug 2004 - Config for Asterisk with Sipgate behind Linksys Router

Has anyone successfully configured an Asterisk box which is behind a (NAT)
router for Sipgate? I have mine behind a Linksys router and can successfully
register and apparently call out but I get no incoming audio and can't be
called from the outside.
 
Any help would be greatly appreciated.
 
Roger
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