I have some trouble.
I have call manager express 4.1 and AIM module witch CUE 3.2.2. I send and receive calls with H.323 protocol, g.729 codec. If i route incoming calls to an extension there is no problem - they can talk, and user from PSTN hear Ringback tone. But, when i route the incoming call to ATT (which is in cue module) and then call transfered from ATT to extension, user from PSTN do not hear a Ringback tone, until hadn-off extension. Then they can talk.
If ATT transfering call oh FXS extension (without SCCP protocol), the PSTN user can hear Ringback tone.
Trunk on CUE is SIP, g.711 codec.
My config in attachment.
My IOS: c2800nm-spservicesk9-mz.124-15.T7.bin