enum RedirectHostUsage

It is the usage of Redirect-Host in client:

DONT_CACHE 0
The host specified in the Redirect-Host AVP SHOULD NOT be cached. This is the default value.
When 0 (DONT_CACHE) is configured, IPWorks AAA will not include the Redirect-Host-Usage and Redirect-Max-Cache-Time AVPs in the reply message to the client.
ALL_SESSION 1
All messages within the same session, as defined by the same value of the Session-ID AVP SHOULD be sent to the host specified in the Redirect-Host AVP.
ALL_REALM 2
All messages destined for the realm requested SHOULD be sent to the host specified in the Redirect-Host AVP.
REALM_AND_APPLICATION 3
All messages for the application requested to the realm specified SHOULD be sent to the host specified in the Redirect-Host AVP.
ALL_APPLICATION 4
All messages for the application requested SHOULD be sent to the host specified in the Redirect-Host AVP.
ALL_HOST 5
All messages that would be sent to the host that generated the Redirect-Host SHOULD be sent to the host specified in the Redirect-Host AVP.
ALL_USER 6
All messages for the user requested SHOULD be sent to the host specified in the Redirect-Host AVP.

References from:: EPCBehaviorControl;

`0`	`DONT_CACHE` The host specified in the Redirect-Host AVP SHOULD NOT be cached. This is the default value. When 0 (DONT_CACHE) is configured, IPWorks AAA will not include the Redirect-Host-Usage and Redirect-Max-Cache-Time AVPs in the reply message to the client.
`1`	`ALL_SESSION` All messages within the same session, as defined by the same value of the Session-ID AVP SHOULD be sent to the host specified in the Redirect-Host AVP.
`2`	`ALL_REALM` All messages destined for the realm requested SHOULD be sent to the host specified in the Redirect-Host AVP.
`3`	`REALM_AND_APPLICATION` All messages for the application requested to the realm specified SHOULD be sent to the host specified in the Redirect-Host AVP.
`4`	`ALL_APPLICATION` All messages for the application requested SHOULD be sent to the host specified in the Redirect-Host AVP.
`5`	`ALL_HOST` All messages that would be sent to the host that generated the Redirect-Host SHOULD be sent to the host specified in the Redirect-Host AVP.
`6`	`ALL_USER` All messages for the user requested SHOULD be sent to the host specified in the Redirect-Host AVP.