With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
voicePortOperDnsServerSource
voice Port Operational Dns Server Source
1.3.6.1.4.1.9.5.1.26.3.1.5
port. fromDhcp(1) indicates that the DNS server IP address comes from the DHCP server. fromPortConfig(2) indicates that the DNS server IP address comes from the object voicePorfIfDnsServerAdress. fromSystemConfig(3) indicates that the DNS server IP address comes from DNS configuration for the system.
Back to CISCO-STACK-MIB MIB page.
IPHost Network monitor allows you to monitor voicePortOperDnsServerSource on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.
