With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
serialConnectOwner
serial Connect Owner
1.3.6.1.2.1.16.19.14.1.8
The entity that configured this entry and is therefore using the resources assigned to it.
Back to RMON2-MIB MIB page.
IPHost Network monitor allows you to monitor serialConnectOwner on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.