I have a strange issue, running CUCM 220.127.116.110-I3 everything works fine as far IPT is concerned. Call manager is integrated with h323 gateway which is 2821, when user tries to initiate conference he/she is able to press Conf button-->dial the second person-->but when he/she presses Conf again to complete Conference....Gateway gives fast busy tone and gives following error.
Cause i = 0x80AF
All the other calls through the same gateway for same destination or different ones works fine but conferencing fails, gateway is running flash:c2800nm-ipvoice-mz.124-22.T.bin.
Any pointer where to look at.