As the example shows in the following figure, MME1 sends a request destined for the HSS but routes by realm (example.com) and Application ID. With dsc_default routing, this request is sent to the first available destination that could be MME2 which would be incorrect.

With Server Pools configured, the message can be routed with those parameters (realm and APP ID) directly to the HSS eliminating the potential for a misdirected message.

Server Pool Use (Example)

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