User equipment, session management node and methods in a communications network

A method performed by a session management node for assisting a User Equipment, UE, in accessing services in an Internet Protocol, IP, Multimedia Subsystem, IMS, network in a communications network, the UE associated to a non-public network, NPN, connected to the communications network, the method comprising:

• establishing a first session by receiving a first request message from the UE, which first request message comprises an indication indicating a session type, the session type being an IMS onboarding session type;
• obtaining, from a data management node, subscription data associated to the UE, which subscription data is related to the indicated session type;
• and
• instructing, based on the indicated session type, a user plane node to enforce a rule, which rule comprises enforcing a server node related to provisioning as the only allowed destination for the first session, enabling the UE to obtain credentials related to the UE from the server node in order to establish a second session to the IMS network and to access services in the IMS network.

A User Equipment, UE, configured to access services in an Internet Protocol, IP, Multimedia Subsystem, IMS, network in a communications network, which UE is configured to be associated to a non-public network, NPN, connected to the communications network, the UE comprising:

• at least one processor;
• at least one memory connected to the at least one processor and storing program code that is executed by the at least one processor to perform operations comprising:
• establish a first session by sending a first request message towards a session management node, which first request message is adapted to comprise an indication indicating a session type for the first session, the session type adapted to be an IMS onboarding session type;
• connect to a server node by using the first session;
• obtain, from the connected server node, credentials adapted to be related to the UE;
• end the first session;
• and
• establish a second session to the IMS network, which established second session is adapted to enable the UE to access services in the IMS network using the obtained credentials in an authentication procedure.

A session management node configured to assist a User Equipment, UE, to access services in an Internet Protocol, IP, Multimedia Subsystem, IMS, network in a communications network, the UE configured to be associated to a non-public network, NPN, connected to the communications network, the session management node comprising:

• at least one processor;
• at least one memory connected to the at least one processor and storing program code that is executed by the at least one processor to perform operations comprising:
• establish a first session by receiving a first request message from the UE, which first request message is adapted to comprise an indication indicating a session type, the session type adapted to be an IMS onboarding session type;
• obtain, from a data management node, subscription data adapted to be associated to the UE, which subscription data is adapted to be related to the indicated session type;
• and
• instruct, based on the indicated session type, a user plane node to enforce a rule, which rule is adapted to comprise to enforce a server node related to provisioning as the only allowed destination for the first session, wherein the rule is adapted to enable the UE to obtain credentials adapted to be related to the UE from the server node in order to establish a second session to the IMS network and to access services in the IMS network.