API not retrieving all Access groups in RTC

Hello,

We have ~300 Access groups in RTC, I need to programmatically retrieve information of the access groups.
I am using below snippet to read all access groups but face problems,

IAccessGroup[] groups;
groups = auditableCommon.getAccessGroups(null, Integer.MAX_VALUE,
    monitor);

This call always returns me info of 250 access groups only. 
This is not respecting 2nd param value (Integer.MAX_VALUE) in retrieving access groups.
How can I retrieve all access groups?

Please note that pattern matching will not help as ~300 access groups have similar naming convention.