CCA-UC560-call from UC560 phones to PBX phones the call is never established.

Question

I have a UC560 which is in a location (remote site) and I have a PBX in other location (headquarters)
The extension of UC560 phones are 3xx y the PBX extensions are 2xx.
I have a Gateway which is connected to UC560 via trunk SIP and this gateway is connected
to PBX via H.323
The UC560 was configured with CCA.
When I call from PBX phones to UC560 phones the PBX phones ring but when the call is
answered the call is finished.
When I call from UC560 phones to PBX phones the call is never established. The PBX phones
don´t ring.
Can you help me with the configuration?

Answer 1

Hi Paolo and Alexander,
First thanks for your help and I apologize for the delay in response because I could not answer before.
I made some changes and now the situation is as follows:
-When I call from PBX phones to UC560 phones the UC560 phones ring and sometimes when the call is answered there are RTP packets (the call is fine) but sometimes when the call is answered there is no voice (there are not RTP packets).
-When I call from UC560 phones to PBX phones the PBX phones ring but in this case there is never voice (there are not RTP packets)
I captured traffic with the Wireshark and I saw the following:
- When the call is fine from PBX Phones to UC560 Phones in the protocol H.245 is opened a logical channel between the PBX and the Gateway H.323-SIP after Terminal Capability Set (Master Slave Determination).
But when the call is not fine because there are not RTP packets I see in the protocol H.245 that no logical channel is opened after between the PBX and the Gateway H.323-SIP after Terminal Capability Set (Master Slave Determination).
Is there some parameter about protocol H.245 on Cisco gateway H.323-SIP which I can change?
If you want I can send the captured traffic.
Regards