Thanks I would create a new trunk for the SBC but that is a last resort I suppose.
To elaborate on the setup a bit more to explain why I am not so happy about doing this.
I have multiple SIP terminations to different carriers. So nit to over complicate this more, E.g. one in Germany and one in the US. On inbound calls I would prefer to handle number normalization directly on the PBX. Therfore technically I would want all calls to come in on the respective trunk.
I am surprised that there seems to be no way to do this. Is it really true?