[SR-Users] How to test registration setting

Hi folks, I would like to know what to use for the following scenario. I want users to be able to test their registration by sending REGISTER and Kamailio sends them 200 OK if credentials are OK. However I don't want the aor to be stored in location table. This REGISTER should be only used for testing the settings. After some time I would allow the registration to be stored and users will normally receive calls. I tried to implement this by not doing save(location) when the flag from load_credential is set. Unfortunately it is the function save who sends 200 OK. When it is not being called, a user agent keeps sending REGISTER until SIP triggers fail. So is there any other common practice how to test registers? Is there any flag that can prevent storing location? Can I send 200 OK to these user in any other way? Thanks Efelin