The unregister functionality for the UAC module is missing. Some sip providers do not allow you to register an account from another node with the current active registration. Accordingly it is difficult to transfer registration from one kamailio to another. Can I implement sending a REGISTER sip message with Expires: 0 when executing kamcmd uac. reg_disable or the additional kamcmd uac.reg_ unregister command -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://github.com/kamailio/kamailio/issues/2549