Refer as teohong have a problem on ACS with our router, till now they summary the problem list us to checking.
Since I'm not in office, please help me test and focus on item 2 first.
Please test and compare the result between P-2612 and P-660HN T1A v1 (True Version) it's same as teohong result or not ?
While testing please capture the packet trace both model, if you found the problem seems as teohong report, please open ITS ticket and attached both model packet trace to CSO to analyze.
Thank you in advance!