If there are multiple WAN interfaces, the router will balance the traffic among all the active WANs. However, we can designate a path for certain traffic by the feature Route Policy. For example, suppose we have two WAN interfaces, where WAN1 has lower latency and jitter so that we want all the SIP traffic (UDP 5060) to use WAN1 as the primary interface.
To do this, go to Routing >> Load Balance/Route Policy to create a rule for SIP traffic.
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