With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cSipCfgTransport
Cisco Sip Configure Transport
1.3.6.1.4.1.9.9.152.1.1.1.2
This object specifies the transport protocol the SIP user agent will use to receive SIP messages. A value of 'disabled' indicates that the UA will not receive any SIP messages.
Back to CISCO-SIP-UA-MIB MIB page.
IPHost Network monitor allows you to monitor cSipCfgTransport 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.