I have recently purchased a WRT54GX v2 and have problems registering multiple SIP devices with my ITSP. I have tried upgrading the firmware to 2.00.08, but this makes no difference. I have also spoken to Linksys tech support, who suggested a couple of things, but when they did not work they could not help me further!! I am using SJ Phone on my laptop, via wireless, a UT Starcom F1000 WiFi phone and a Sipura 3000. I have 2 numbers with my ITSP. The first device that attempts to register is successful, and works fine, any other device that tries after this is unable to register. I have tried the same setup with a Cisco 831 and a Netgear WGR614, and have had no problems, all devices are able to register and work fine - its only the Linksys that I am having problems with... Is anyone having a similar problem? Can anyone help please?