Hi, thanks for the reply. I haven't found an expires paramater of usrloc module, maybe you mean the expires of registrar module: modparam("registrar", "max_expires", 3600) If it is so, I have tried with the same value for presence and registrar modparam("presence", "max_expires", 3600) and with presence expires greater than the registrar expires modparam("presence", "max_expires", 4000) I have repeted the test and I have seen that the error messages occur when I deregister and reregister the subscribed client, but I think that the error could be related to the fact that the subscriber (Eyebeam) refuses the first NOTIFY (why?) sended by openser for the first REGISTER from the subscribed. In the attached file you can see the syslog with debug level = 9 ********************************************************************** The information in this message is confidential and may be legally privileged. It is intended solely for the addressee. Access to this message by anyone else is unauthorized. If you are not the intended recipient, any disclosure, copying, or distribution of the message, or any action or omission taken by you in reliance on it, is prohibited and may be unlawful. Please immediately contact the sender if you have received this message inerror. **********************************************************************