AE with inbound SIP and RTP over UDP - Will not open ports

I am using a Linksys SPA962 IP Phone via an Airport Express with the latest firmware connecting to an Asterisk PBX (http://www.asterisk.org) over the internet. I may make outbound calls and have my incoming and outgoing audio over RTP with the appropriate UDP ports no problem. But, when I receive an inbound call, I get the SIP INVITE no problem, but the AE refuses to open those RTP ports. I have NAT keep alive at 15 seconds.
Now, I have tried almost every combination. Enabling NAT-PMP forwarding to all of the appropriate IP/Ports, turning it off (really should not be necessary with keep alive on register with the Asterisk). I am stumped, it is almost as of AE does not like UDP for inbound. I have others using Linksys routers with a similar configuration working inbound and outbound no problem.
I am stumped. Ideas? Chuck the AE in the bin?

I Googled up the following:
http://lists.apple.com/archives/Macnetworkprog/2006/Jul/msg00040.html
I am having this issue:
http://discussions.apple.com/message.jspa?messageID=7256265#7256265
Are all these things the same issue?
My ISP "tells me" that they will not allow more than one IP address per account. I have a basic cable modem i.e. not a router. Its a D-Link DCM-202. I have been told to try a level-2 switch but I can't see how that will work. As far as I can see the DCM-202 cable modem is bridging to my AEBS so that is allocated the WAN IP address by the ISP's DHCP server. Does this sound right?
I'd like to create an actual DMZ but since my cable modem only has one port I can't see how I can do that unless I use 2 routers. If I try this I am expecting that I'd have complicated port forwarding configurations no?

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