Dear Phoneby, thank you for your interest.
What goes wrong is the following. When you fill out the form (IP address, display name and phone number) a new widows pops out where you have to click "Install certificate". On Sipura after you click it the certificate is installed. On PAP2 when you click it you get "page cannot be found". The address in my bowser points to
http://192.168.1.104/admin/asipura.spa (192.168.1.104 is indeed the ip address of my PAP as I get get to the admin web pages). I guess the problem is with ".../asipura.spa" I'm sure linksys guys when they cloned the firmware has changed it to something else.