Page 464 - 5G Basics - Core Network Aspects

1 Core network aspects

9.2 Signalling requirements

9.2.1 Requirement on the interface between PAM-SCP and IP
The PAM-SCP controls the in-band FSK interaction between the IP and the AP in the scenario of user
registration and deregistration through the PSTN access.

The signalling between the PAM-SCP and the IP needs to support that the PAM-SCP could instruct the IP to
conduct the sending and receiving of FSK signals.

9.2.2 Requirement on the interface between PAM-SCP and HLR/AuC (HSS)
The interface between the PAM-SCP and the HLR/AuC (HSS) needs to support the following functions:

• The PAM-SCP retrieves the authentication data from the HLR/AuC (HSS).
• The PAM-SCP retrieves the MSISDN and the user's service profile from the HLR/AuC (HSS).
• The PAM-SCP modifies the mobile user's IN service subscription status in the HLR/AuC (HSS)
(optional).
9.2.3 Requirement on the interface between PAM-SCP and SSP

The signalling between the PAM-SCP and the SSP needs to allow the PAM-SCP to instruct the SSP to overwrite
the calling party number in call set-up request.

The modification of the calling party number by PAM-SCP is used in the following cases:
• In originating call, the PAM-SCP needs to set the PAM service number as CLI to be presented to the
called party.
• In terminating call, the PAM-SCP needs to add the terminal identifier in the CLI which will be
delivered to the AP during call establishment.

9.3 Call flows
This clause provides the call flows for the PAM service.

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