Avaya Exam 31860X Topic 1 Question 23 Discussion

A customer with an existing Communication Manager 6 (CM) duplex solution with g4bos and isdn trunks at their main location, is adding some remote sites with G430 gateways and local ISDN trunks for survivability and local calling. They will be inter-connecting them with an MPLS network with limited bandwidth to these remote sites. They want a network design that will restrict voice traffic to a defined level with the ability to overflow to the PSTN.

What would be the minimum network region design look like?