Network nodes and methods performed therein for handling call information for a user equipment

A first network node in a wireless communications network, for handling an addition of a participant to an ongoing call session for a first User Equipment (UE) handled by an IP Multimedia Subsystem (IMS) node, wherein the ongoing call session is a session between the first UE and a second UE, the first network node comprising:

• communication interface circuitry for communicating with one or more other network nodes;
• and
• processing circuitry operatively coupled to the communication interface circuitry;
• and
• memory operatively coupled to the processing circuitry and storing program instructions and configured to, upon execution, cause the first network node to:
• receive, from a second network node, a request to add a participant to an ongoing call session for the first UE;
• obtain a list of one or more ongoing call sessions for the first user from the IMS node, wherein the list comprises an identifier for identifying each of the one or more ongoing call sessions;
• send, to the IMS node, a request to add the participant to one of the one or more ongoing call sessions for the first UE, wherein the request comprises the identifier for identifying the call session to which the participant is to be added and an identification of the participant to add to the ongoing call session.

A second network node in a wireless communications network, for handling an addition of a participant to an ongoing call session for a first User Equipment (UE), wherein the ongoing call session is handled by an IP Multimedia Subsystem (IMS) node, wherein the ongoing call session is a session between the first UE and a second UE, the first UE and second UE being distinct from the second network node, the second network node comprising:

• communication interface circuitry for communicating with one or more other network nodes;
• and
• processing circuitry operatively coupled to the communication interface circuitry;
• and
• memory operatively coupled to the processing circuitry and storing program instructions and configured to, upon execution, cause the second network node to:
• obtain, from a user of the first UE, a request to add a participant to the ongoing call session;
• send, to a first network node distinct from the second network node and from the first and second UEs, a request to add the participant to the ongoing call session for the first UE.

An IP Multimedia Subsystem (IMS) node in a wireless communications network, for handling an addition of a participant to an ongoing call session for a first User Equipment (UE), wherein the ongoing call session is handled by the IMS node, wherein the ongoing call session is a session between the first UE and a second UE, the IMS node comprising:

• communication interface circuitry for communicating with one or more other network nodes;
• and
• processing circuitry operatively coupled to the communication interface circuitry;
• and
• memory operatively coupled to the processing circuitry and storing program instructions and configured to, upon execution, cause the IMS node to:
• receive, from the first network node, a request for ongoing call sessions for the first UE;
• send, to the first network node, a list of one or more ongoing call sessions for the first user from the IMS node, wherein the list comprises an identifier for identifying each of the one or more ongoing call sessions;
• receive, from the first network node, a request to add the participant to one of the one or more ongoing call sessions for the first UE, wherein the request comprises the identifier for identifying the ongoing call session to which the participant is to be added and an identification of the participant to add to the ongoing call session.