Presence Services to Presence Services federation between two clusters on the same System Manager works without explicit configuration. The two clusters may also share one or more domains. There are no domain limitations or requirements for federation to work.
To set up Inter-PS federation, you will need:
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Two Presence Services clusters on the same System Manager, that is, two Avaya Breeze® platform core clusters running Presence Services.
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Presence Communication profile set up correctly for users, that is, Aura presence users must be assigned correctly to the presence clusters. This setting is required for Presence/IM to work.