Hi, I am testing simple(vs clean, per Jiri) t_replicate(server 2) on "REGISTER" from server 1 to another ser server 2. Server 2 logs "ERROR:registrar:update_contacts: invalid cseq for aor...". ngrep shows that server 1 send "REGISTER" twice. May be the re-transmitted request causes the incalid cseq? Can anyone tell me how to fix this problem? John Chahn Kim