[VoiceOps] Selecting correct source on Net VX SBC

[Nick Brown]

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.

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