Hi, I have two Grandstream HT's and a SER server running on RedHat 9.0. Both phone register and call each other fine, but for some reason, after a random amount of time, the audio stops working in one direction. It doesn't make any difference what the register time is or if a different codec is used, it still does it. If you make calls back and forth ie call one end hand up call from the other end and hang up, it's fine for ages, it just seems to fail audio in one way after you have not made a call for a while. It won't recover from this state until you reboot either phone at either end. Both phones are on a wired CAT5 100MB LAN without any NAT between them. Any ideas ? Thanks BJ _________________________________________________________________ Find love today with ninemsn personals. Click here: http://ninemsn.match.com?referrer=hotmailtagline