Here's the info that you were looking for: ftp://ftp-sj.cisco.com/pub/mibs/oid/CISCO-RTTMON-MIB.oid
"rttMonJitterStatsMinOfMOS" "1.3.6.1.4.1.9.9.42.1.3.5.1.56"
"rttMonJitterStatsMaxOfMOS" "1.3.6.1.4.1.9.9.42.1.3.5.1.57"
"rttMonLatestJitterOperMOS" "1.3.6.1.4.1.9.9.42.1.5.2.1.42"
MOS was introduced in 12.3(4)T. Prior to 12.3(7)T, MOS value were returned as whole numbers only, rate from 1 (Bad) to 5 (Excellent), and afterwords it changed to show the decimal value from 100 to 500. More info about CISCO-RTTMON-MIB (which is where these
OIDs are defined) can be found here:
http://tools.cisco.com/ITDIT/MIBS/servlet/index