oisutra

Hi. I am experiencing problems with asterisk. Due to some kind of registration timeout, I get disconnected every hour, more or less. After the time-out, Express Talk is no longer reachable. I know that the SIP protocol should send a 'REGISTER' message to the pbx regularly, but express talk seems to do it only when I start it. Is there a way to configure Express Talk in order to make it register regularly ? I have a hard-phone which does, and encounters absolutely no registration problems. Thanx in advance