I have followed the steps that you posted and have my 2b account running on a PAP2-NA (behind the Linksys BEFSX41). I can make out-going calls with no problem, but the line is drop when receving incoming calls. The syslog is attached. Please advice if you have any suggestions. Thanks.
A lot of people are having the same problem with incoming calls to PAP2/SPA devices. I hope to investigate this issue when I get my PAP2s within this week.