[Users] openser+freeradius+mysql

Hi all, I use the document to build l the system with openser+freeradius+mysql( http://www.openser.org/docs/openser-radius-1.0.x.html), +---------+ +---------+ | PHONE 1 | <--SIP-- + +-------------------+ | STORAGE | +---------+ | SIP SERVER | +----+----+ #===> | (OpenSER) | | ........... | |-------------------| +-------+-------+ | | RADIUS CLIENT|<==AAA==> | RADIUS SERVER | +---------+ | | (radiusclient-ng) | | (FreeRADIUS) | | PHONE N |<--SIP--+ +-------------------+ +---------------+ +---------+ I have two linux PCs.the one install Openser and radius client ,and another install freeradius and DATABASE of mysql .But the document said the Openser also need mysql ,then I have a question, what is the function about the mysql of openser? Maybe it can place the users inforamtion of register,but for freeradius, what about the function ? Then I have another question,I install the system step by step with the document ,and the ua can register correctly,but a few minutes it will break down, the ua said it's time out ,can you give me some suggestion ?can I find other openesr+ freeradius documents except *openser-radius-1.0.x.html* . thaks.