I have a customer who has a 4.1(3) CUCM Cluster and needs to interface with a Mitel 3300 across a private P2P WAN for the purpose of initiating and transferring calls (in both directions).
Both endpoints support SIP and the functions required should work however the WAN has a FW at either end with NAT configured either on teh FW or WAN Router.
I understand that I need to use a SBC to manage this NAT traversal
Could someone please explain
1) What I need?
2) And what topology this should be deployed in?
I have attached a basic schematic that illustrates my situation.
Any help would be greatly appreciated,