opeanser can handle how many regitration

Please tell me the approximately number of users can be regist on the openser, In anouther word, how many users can regist on openser, which means, opeanser can handle how many regitration, just an approximately number is fine~~~THX.

We've had up to 20,000 on ours and the CPU was still idling (with re-reg set at about 5 minutes).

You may be interested in the results of the test conducted in this whitepaper:-

http://www.voipuser.org/forum_topic_9570.html

thank you very much