Oracle Communications Core Session Manager Authentication Check
At this point, the Oracle Communications Core Session Manager has received an MD5 hash from the HSS and an MD5 hash from the UA. The Oracle Communications Core Session Manager compares the two values and if they are identical, the endpoint is successfully authenticated. Failure to match the two hash values results in a 403 or 503 sent to the authenticating endpoint.
The following image shows the User Authorization and Authentication process:
![This image displays the OCUSM or OCCSM supporting a registration authentication check. This image displays the OCUSM or OCCSM supporting a registration authentication check.](img/cxauthorizationauthentication.png)
Note:
Diagram information states "USM/CSM" when the applicable content applies to both the Oracle USM and the Oracle CSM.The Oracle Communications Core Session Manager acts as a SIP Registrar and updates an HSS with the state of its registrants.