Hi I use kamailio 4.0.3 with presence. I sometimes get these errors: Oct 4 09:26:24 server /usr/sbin/kamailio[1292]: ERROR: presence [publish.c:171]: msg_presentity_clean(): Marking presentity Oct 4 09:26:34 server /usr/sbin/kamailio[1292]: ERROR: db_mysql [km_dbase.c:122]: db_mysql_submit_query(): driver error on query: Duplicate entry 'username-domain-presence-*#-OFFLINE-#*' for key 'presentity_idx' Oct 4 09:26:34 server /usr/sbin/kamailio[1292]: ERROR: <core> [db_query.c:337]: db_do_update(): error while submitting query Oct 4 09:26:34 server /usr/sbin/kamailio[1292]: ERROR: presence [presentity.c:1281]: mark_presentity_for_delete(): unsuccessful sql update operation This is when multiple SIP clients are registered using the same credentials, they each have a presentity entry, with the same username and domain but different etags, which is fine. But when they expire, the presentity.etag will be filled with '*#-OFFLINE-#*', and when both expire at about the same time, kamailio tries to fill both with the same '*#-OFFLINE-#*' etag. Because presentity table has a 'CONSTRAINT presentity_idx UNIQUE (username, domain, event, etag)', this gives the errors. Should the constraint be removed to cope with this situation? Thank you! Yufei -- Yufei Tao Red Embedded This E-mail and any attachments hereto are strictly confidential and intended solely for the addressee. If you are not the intended addressee please notify the sender by return and delete the message. You must not disclose, forward or copy this E-mail or attachments to any third party without the prior consent of the sender. Red Embedded Design, Company Number 06688253 Registered in England: The Waterfront, Salts Mill Rd, Saltaire, BD17 7EZ