I'm the topicstarter at http://code.google.com/p/csipsimple/issues/detail?id=1120&start=200 http://forums.grandstream.com/forums/index.php?topic=9996.0 Can you fix, or help let's grandstream developers fix it. In my network is 30% it's Grandstream devices and lot of newble customers with csipsample. Grandstream 100008 at ipshka.com open for a public access. If you need tcpdump from the site before switch let's me know will be forwarded privately. Thanks in advance.