With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cSipCfgTimerReliableRsp
Cisco Sip Configure Timer Reliable Rsp
1.3.6.1.4.1.9.9.152.1.1.2.7
This object specifies the amount of time to wait for a PRACK before retransmitting the reliable 1xx response.
Back to CISCO-SIP-UA-MIB MIB page.
IPHost Network monitor allows you to monitor cSipCfgTimerReliableRsp on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco switches right now.