Morning All, We are working with a Net VX SBC that has multiple customers downstream and a single carrier upstream, to all intents and purposesthe downstream customers have services directly with the upstream carrier. The upstream carrier allocates a set of credentials which are ACL'ed to a specific point-to-point subnet for each service. In our scenario we have a set of credentials and corresponding interconnect for each downstream customer. The carrier provides a single set of signaling and media addresses across all services.. To the best of our knowledge, the SBC only supports a single routing instance, hence when traffic destined for the upstream provider is sent out, it can only follow one route. To get around this, and ensure that traffic goes out over the correct point-to-point interface, we intended to impliment a policy-based-route, assuming that the SBC would source traffic from the IP of the SIP instance regardless of what interface the traffic left the SBC on, this appears to be incorrect however and the traffic is always sourced from the IP on the interface of the default route. Interestingly at a SIP layer everything looks OK. To further complicate matters the SBC is managed by a third party. Has anyone done anything similar in the past, with Net equipment or otherwise? Any feedback much appreciated. Cheers Nick.