SBC always take same interface for outgoing calls

[walruses]

Hi everyone, does anybody have an idea with this issue?

I have carriers A, B and C connected to my SBC for incoming calls.
Carrier A has its own interface.
Carriers B and C shares another interface with a public IP.
One of my clients wants to take carrier C for outgoing calls but SBC always tries to connect the call through carrier's A Intarface.

I have tried to stablish different priorities in Routing Profiles and in Network Flows but the result is always the same.

Can anyone give a hint of what I'm doing wrong?

Best regards.