With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swVoiceVlanOuiTable
Switch Voice Vlan Oui Table
1.3.6.1.4.1.171.12.74.3.1
The Management information of the voice VLAN OUI.
Back to VOICE-VLAN-MIB MIB page.
IPHost Network monitor allows you to monitor swVoiceVlanOuiTable on D-Link device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring D-Link switches right now.
