Egress sip-port

Hi!

I wonder how to force SBC to choose a particular sip-port on egress. In my case there are 4 sip-ports in realm "Core". SBC always use the first port in row for outbound REGISTERs (172.1.2.100:5060, UDP), but in some scenarios a TCP transport shall be used instead (port #3). Does anybody know how to do it?

sip-interface
        state                                   enabled
        realm-id                                Core
        description
        sip-port
                address                                 172.1.2.100
                port                                    5060
                transport-protocol                      UDP
                tls-profile
                allow-anonymous                         realm-prefix
                multi-home-addrs
                ims-aka-profile
        sip-port
                address                                 172.1.2.100
                port                                    5090
                transport-protocol                      UDP
                tls-profile
                allow-anonymous                         agents-only
                multi-home-addrs
                ims-aka-profile
        sip-port
                address                                 172.1.2.100
                port                                    5060
                transport-protocol                      TCP
                tls-profile
                allow-anonymous                         agents-only
                multi-home-addrs
                ims-aka-profile
        sip-port
                address                                 172.1.2.100
                port                                    5090
                transport-protocol                      TCP
                tls-profile
                allow-anonymous                         agents-only

Thanks in advance and best regards.