You want to know if CUCM is using 30ms packetization. I am not sure if that trace is tellign you its using 20ms packetization. But if you enable "debug ccsip messages" on your CUBE., the "a=ptime" attribute in your SDP will tell you what packetization your call is using.
Content-Type: application/sdp Content-Length: 237
v=0 o=CiscoSystemsCCM-SIP 23139 1 IN IP4 188.8.131.52 s=SIP Call c=IN IP4 184.108.40.206 t=0 0 m=audio 21192 RTP/AVP 18 101 a=rtpmap:18 G729/8000 a=ptime:20------->This attribute tells you what packetization your call is using (here its 20ms)
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