I have 3 extensions on new system. Each extension has same configuration, LAN and phone. One of the extensions is unregistering every couple of minutes. ExtnCfg::updateContact [CM504002]: Ext.1002: a contact is unregistered. Contact(s):  And then after 10-15 minutes re-registering again ExtnCfg::updateContact [CM504001]: Ext.1002: new contact is registered. Contact(s): [sip:email@example.com:5060;transport=udp/1002] Any ideas how to fix it??