With IPHost Network Monitor you can run simple snmp requests against a D-Link device in your network.
swVoiceVlanLogState
Switch Voice Vlan Log State
1.3.6.1.4.1.171.12.74.1.5
This object indicates the voice VLAN log state.
Back to VOICE-VLAN-MIB MIB page.
IPHost Network monitor allows you to monitor swVoiceVlanLogState 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 VPN routers right now.