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SBC setup, two SIP providers, one PBX

Is it possible to setup a 3430 with media anchoring with two external trunks, one to each provider, going to one PBX? 

Basic plan is this: 

1. setup existing carrier for inbound calling to fulfil the customer's existing contract.

2. add a trunk from our switch for some inbound and all oubound traffic.  Is it possible to have the AOS device control which trunk outbound calls go to  ?  Failover to the other trunk if one is unavailable?

Can this be done with a single IP address?  Do we need multiple addresses ?  Either scenario is possible.


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