With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ccmeEphoneAutoLineOut
Cisco Call Manager Express Ephone Auto Line Out
1.3.6.1.4.1.9.9.439.1.1.43.1.8
Indicates the line (Ephone-DN) that will be selected for out going calls when this Cisco IP phone goes off-hook.
Back to CISCO-CCME-MIB MIB page.
IPHost Network monitor allows you to monitor ccmeEphoneAutoLineOut 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.