ZyXEL Communications APS 1.0 Administrator's Manual page 20

Auto Provisioning Administrator's Guide
By default the sample SER server does not enforce any security so a SIP device does not have
to be registered to use it. When you implement the auto provisioning server system, you will
want to have the CRM server and SIP server interact to make sure that only registered SIP
devices can use the SIP server.
20 Chapter 1 Auto Provisioning