I'm trying to set up 2 2920 routers so that they connect together through the WAN2 ports.

Each router will be located in seperate offices and connected via a leased fibre to fibre.

Connected to each router will be a phone system which I need to be able to communicate to each other for VoIP communication.

Phone System -- LAN -- [2920] -- WAN2 -- [leased fibre] -- WAN2 --[2920] -- LAN -- Phone System

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For anyone else coming across this sort of scenario. One pitfall is that the G/W address oneach wan port needs to be set. Set it to the wan ip of the opposite router and vice versa to ge around the Wan disconnection detection mechanism requiring ARP replies from the G/W