I am attempting to replace an old netgear router with a "real" router, a 1721. everything works great except passing SIP inbound from remote extensions. A normal ip nat inside source static forwarding works for one port, but the voice path RTP addresses are a block of 10000 ports. I have tried without much luck the method shown in my config attached.
I plead ignorance here, as I can't see why this doesn't forward any udp packets.
Can someone enlighten me please?