Kindly look into the below scenario and suggest any possibilities.
In the given scenario, the customer has two ISP links and a Cisco VC endpoint operating as a stand-alone device. Normally, when one ISP link goes down, the traffic is expected to flow through the second ISP link as a failover mechanism. However, during MS Teams calls through the VC endpoint, this failover does not occur.
Is there any specific configuration required to check on the VC endpoint side?
Nope, there is nothing you can do, because the failover is not happening on the endpoint. IP routing and failover has nothing to with the endpoint. You / network engineer has to check the network config.