Thank you for your quick reply. I have been out of the office all last week so I was just able to try it out. I changed the new_udomain to 2 in the dlist.c file. It didn't seem to change anything. I was still about to register 8000 users. Let me explain what I'm trying to do, maybe you can steer me the correct way. I have a mysql database created which the SER successfully updates with the user registrations. What I would like to have happen is have 100,000 users registered with the SER storing only 1000 users in memory and performing database lookups to find the location of the other users. These numbers are just made up but is something like this possible? I tried to register users yesterday and when it had registered 78682 it said it ran out of memory. How can I get the SER to store fewer users in memory but still update the database for future lookups? Thank you for any help you can provide. Kent -----Original Message----- From: Bogdan-Andrei Iancu [mailto:bogdan@voice-system.ro] Sent: Friday, March 31, 2006 1:35 AM To: Poppenhouse Kent-P28924 Cc: users(a)openser.org Subject: Re: [Users] registrar table size Hi, the size of the hash table is hardcoded (no config option :( ). See modules/usrloc/dlist.c line 341, the call of new_domain() - second param is the size. Note that the size must be a power of 2! regards, bogdan Poppenhouse Kent-P28924 wrote: -