Hi, I have recently migrated numerous sites from Call Manager Express to the central Call Manager Cluster using H323 for call set up to the sites local gateways. Most of the sites are OK, however 2 sites have complained of poor call quality, i.e. silence and cut outs for all calls whether across the WAN or through the PSTN. I am using G729 across the WAN but G711 to the PSTN. All set ups are identical. Does anyone have any ideas?