it looks the email I sent yesterday has been blocked because of its size by the mailing-list agent.
-pascal
OK good news, with the lastest of 1.5 branch I could not reproduced the bug I reported.
I've sent something like 3x1000 SIP PUBLISH requests and couldn't get the error (with 1.5.1. after 40-50 req, the bug was reproduced easily).
Thanks a lot to both for your help!
-pascal