failover help for VoIP

I have two Edgemark modems which are also routers.

Edgemark 1 is from my primary ISP provider used for VoIP traffic
Edgemark 2 is from my VoIP provider used for VoIP management/routing

I also have a second internet provider

Edgemark 2 connects to Edgemark 1.  VoIP traffic is thru our primary internet.

I need to figure out how to setup a VoIP failover so that if my primary ISP providers internet goes down we can failover to my second internet provider.  I already reached out to my VoIP provider and primary ISP provider support  but they cannot figure out how to setup it up using their equipment.  (edgemark 1 and edgemark 2)

Is there a device I can purchase to handle the VoIP failover.  Here is how the two edgemarks are connected.

Outside T1 -- T1 port (Edgemark 1)
LAN1 port (Edgemark 1) to WAN port (Edgemark 2)
LAN1 port (Edgemark 2) to local VoIP LAN switch
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Rick HobbsRETIREDCommented:
Add any dual-wan Ethernet router with fail-over.  Place it between primary wan plus secondary wan on the new router's WAN links.   Connect an Ethernet port from the failover router to each of the LAN1 Edgemarks either using LAN ports on the failover router or, if the failover router has only one LAN port, using a switch.

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paul_techyAuthor Commented:
sorry for the delay in this but I am going to test it out soon.  thanks!
Rick HobbsRETIREDCommented:
Thank you.  It is the setup I use for all of the small clients that want close to 100% uptime for their VOIP (Dr. Offices, etc.)
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