PSI identifies a service (presence, messaging, conferencing etc.), or a specific resource created for a service on an application server and is based on local configuration policy, so PSI can be routed over Inter Operator Network to Network Interface.
These PSI are created on the fly i.e. they may be created by the user on an as -needed basis in the AS and are not registered prior to usage.
Usage:
Public service identities take the form of SIP URI or are tel URL format.
In messaging services there is a public service identity for the messaging list service (e.g., sip:sms@irns.example.com) to which the users send messages and messaging list server.
The same applies to conferencing services (i.e., audio/video and then the messages are distributed to other members on the messaging list by the messaging sessions), where a URI for the conferencing service is created.
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