Gateway node, user equipment and method for enhancing a call session between user equipments using a data channel

A method performed by a User Equipment, UE, for enhancing a call session between a first UE and a second UE in a communications network, wherein the second UE is associated to a Private Branch Exchange, PBX, node, the method comprising:

• after a call session has been established between the first UE and the second UE via the PBX node and via an Internet Protocol Multimedia Subsystem, IMS, network, sending to a gateway node, a request for establishing a data channel to enhance the call session between the first UE and the second UE,
• negotiating one or more parameters to be used in the requested data channel between the first UE and the second UE, and
• establishing the requested data channel to enhance the call session between the first UE and the second UE, using the negotiated one or more parameters;
• wherein the UE is represented by any one out of the first UE and the second UE;
• wherein the request to establish the data channel comprises one or more first parameters related to the requested data channel, wherein the one or more first parameters are accepted by the first UE, and wherein the negotiating of the one or more parameters to be used in the requested data channel comprises:
• receiving, from the gateway node, an accept message, indicating that the second UE accepts the request to establish the data channel, wherein the accept message comprises one or more second parameters related to the requested data channel, wherein the one or more second parameters are accepted by the second UE based on the one or more first parameters accepted by the first UE,
• wherein the data channel to enhance the call session is established based on the one or more parameters.

A gateway node configured to enhance a call session between a first User Equipment, UE, and a second UE in a communications network, wherein the second UE is adapted to be associated to a Private Branch Exchange, PBX, node, the gateway node further being configured to:

• after a call session has been established between the first UE and the second UE via the PBX node and via an Internet Protocol Multimedia Subsystem, IMS, network, receive, from any one out of the first UE and the second UE, a request for establishing a data channel to enhance the call session,
• negotiate one or more parameters adapted to be used in the requested data channel between the first UE and the second UE, and
• establish the data channel according to the negotiation, to enhance the call session between the first UE and the second UE;
• wherein the gateway node is further configured to negotiate the one or more parameters adapted to be used in the requested data channel by:
• sending, via a connection established between the gateway node and the second UE, to the second UE one or more first parameters adapted to be related to the requested data channel, wherein the one or more first parameters are adapted to be accepted by the first UE and are adapted to be obtained from the received request for establishing the data channel,
• when receiving, from the second UE, one or more second parameters adapted to be related to the requested data channel, wherein the one or more second parameters are adapted to be accepted by the second UE based on the one or more first parameters adapted to be accepted by the first UE, send an accept message to the first UE, wherein the accept message is adapted to indicate that the second UE accepts the request to establish the data channel, wherein the accept message is adapted to comprise the one or more second parameters, and
• wherein the data channel to enhance the call session is adapted to be established based on the one or more parameters.

A User Equipment, UE, configured to enhance a call session between a first UE and a second UE in a communications network, wherein the second UE is adapted to be associated to a Private Branch Exchange, PBX, node, the UE further being configured to:

• after a call session has been established between the first UE and the second UE via the PBX node and via an Internet Protocol Multimedia Subsystem, IMS, network, send to a gateway node, a request for establishing a data channel to enhance the call session between the first UE and the second UE,
• negotiate one or more parameters adapted to be used in the requested data channel, and
• establish the requested data channel to enhance the call session between the first UE and the second UE, by using the negotiated one or more parameters;
• wherein the UE is represented by any one out of the first UE and the second UE;
• wherein the request to establish the data channel is adapted to comprise one or more first parameters related to the requested data channel, wherein the one or more first parameters are adapted to be accepted by the first UE, and wherein the UE further is configured to negotiate the one or more parameters adapted to be used in the requested data channel by:
• receiving, from the gateway node, an accept message adapted to indicate that the second UE accepts the request to establish the data channel, wherein the accept message is adapted to comprise one or more second parameters related to the requested data channel, wherein the one or more second parameters are adapted to be accepted by the second UE based on the one or more first parameters adapted to be accepted by the first UE,
• wherein the data channel to enhance the call session is adapted to be established based on the one or more parameters.