A. The VLAN on which UBT clients are placed is not configured on the switch uplink and traffic from the VoIP phones is being dropped
B. You tailed to correctly configure a user-defined VRF to support the UBT clients behind the VoIP phones, causing traffic to drop.
C. Broadcast/multicast packets are copied to both the tunnel and locally, causing duplicate packets and network instability
D. The UBT client broadcast/multicast packets returned to the same switch port and corrupted the phones IMC table
Explanation:
If users report interruptions to their phone service after the deployment of User-Based Tunneling (UBT), it can be due to the VLAN designated for UBT clients not being configured on the switch uplink. As a result, traffic from VoIP phones, which may be trying to use the same VLAN, could be dropped, leading to service interruptions. Ensuring that the VLAN is properly configured on the switch uplink is crucial for the seamless operation of UBT clients and VoIP services.