Single OCS Pool Mode

When OC-DRA is operating in Single OCS Pool mode, session initiation requests are load balanced across all available OCS servers connected to the PCA DSR.

Note:

OC-DRA removing the Destination-Host AVP from the Online Charging Diameter Request when operating in the Single OCS Pool mode ensures that the request will not be accidentally rejected by the PRT or by the OCS Server if the Destination-Host AVP contained the PCA DSR's hostname.

In this mode, OC-DRA removes the Destination-Host AVP (if present) from the session initiation request and forwards it to DRL where PRT/RL is used to route the session initiation request to one of the available OCS servers connected to the PCA DSR.

Note:

OC-DRA does not specify the PRT/RL that is used by DRL to route Diameter request messages to an available OCS. The PRT selected for routing is based on DRL's PRT precedence rules

Figure 5-1 Local OCS Server Selection