[Asterisk-Users] Port forwarding on a DLink Di-604

[hugolivude]

Anyone know how to set up port forwarding of multiple ports on a DLink DI-604?

I successfully portforward the SIP port on the Advanced|Virtual Server
page.  It works because I can register a SIP client, but it's a single
port - 5060.

The DLink doesn't seem to provide an obvious way of portfarding the
10000 - 20000 ports needed for RTP.

Any ideas?
Hugh