We are having problem when transfering calls from analog to analog phone at the remote site. Please see the attached diagram. That phones are conected to a mini-PBX. The problems starting after we migrate the FXO from the PBX to the C2821 Cisco in order to have more lines to link the ISP. At that time we change from H323 to MGCP. Then when an analog try to tranfer one call no another analog, the original caller and the called get noise. The FXOs and FXSs are registered at the CallManager 6.1 cluster. Any help will be welcomed.