This attribute is applicable for the RADIUS Server event.
For Active Directory, when the Framed IPv4 Address is blank, the Advanced Authentication RADIUS server returns value of the msRADIUSFramedIPAddress attribute as Framed-IP-Address after you log in with the RADIUS event. When you specify any other attribute in Framed IPv4 Address attribute, then the value of the specified attribute is returned as the Framed-IP-Address instead of the msRADIUSFramedIPAddress attribute value. You can configure the Framed-IP-Address in Active Directory Users and Computers > Dial-in > Assign Static IP Addresses and click Static IP Addresses. It supports only IPv4.
For the other repositories, when the Framed IPv4 Address is blank, the Advanced Authentication RADIUS server returns value of the radiusFramedIPAddress attribute as Framed-IP-Address after you log in with the RADIUS event. When you specify any other attribute in Framed IPv4 Address attribute, then the value of the specified attribute is returned as the Framed-IP-Address instead of the radiusFramedIPAddress attribute value.