Just checking to see if there has been any more progress on this. I am currently testing 4.2.0.3961 and it has the advantage of the cseq numbers staying in sequence as long as the PBX is not restarted (this was a problem in the original 4.2 release, and fixed about half way through), however when the PBX is rebooted, Aastra, Grandstream, and Yealink BLFs stop working when the get the 410 error from the PBX. I know this was added as an attempt to fix Aastra BLFs after a reboot, however it has not, and it has created a new problem with Yealink, and Grandstream (that accept out of sequence cseq numbers). I was wondering if we could find a middle ground where the PBX does not send a 410 after a reboot, however the cseq numbers stay in order as long as the PBX is not rebooted. I feel this is the best compromise so far.