The Endpoint Data Summary dashlet reports on IP endpoints that are SNMP enabled and excludes endpoints that are gateways.
The summary count at the top of the dashlet includes where endpoints have settings that can result in voice degradation. For example:
- VLAN = 0: These endpoints can contribute to poor voice quality, since VLAN 0 is the broadcast VLAN and does not support QoS.
- DSCP ≠ 46: DSCP is used to define priority for network traffic. For best results it's recommended that DSCP is set to 46 (expedited forwarding).
Further detail is provided in the body of the dashlet.
- VLANs are grouped by Subnet, IPNR and DHCP.
- Network and Protocol are grouped by Subnet and IPNR
- To see which specific endpoints might be mis-configured – click on 'Endpoints' for a link to the Phone Data Report found in Configuration Manager.
VSM's AI Engineer, Alex offers recommendations for resolving issues on each tab. 
Endpoint Data Summary dashlet
VLAN Panel
Stream data is presented by Subnet or IPNR or DHCP Server.
Most commonly:
- all endpoints in a given subnet are in the same VLAN.
- all endpoints in a given IPNR are in the same VLAN or group of VLANs
- all endpoints using a given DHCP are in the same VLAN or group of VLANs
VLAN Panel – DHCP tab
Network Panel
Voice degradation can be caused by incorrect Ethernet configuration or negotiation. Best practise has ethernet settings set to auto-negotiation, ethernet speed is 100 Mbps or 1 Gbps and Ethernet Duplex is full. Half duplex will most certainly cause issues, even when there is no contention with other applications for bandwidth. 
Network Panel - Subnet tab
Protocol Panel
In some cases voice degradation is caused by incorrect 802.1Q configuration. Best practice is priority 6 for signalling and priority 6 for audio.
- Priority settings may vary between deployments, depending on IP network design.
Protocol panel – Subnet tab