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1. (WO2019001749) A METHOD OF ESTABLISHING A VOICE OVER INTERNET PROTOCOL, VOIP, CALL BETWEEN A CALLING USER EQUIPMENT, UE, AND A CALLED UE.
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CLAI MS

1 . A method of establishing a Voice over Internet Protocol, VoI P, call between a calling User Equipment, UE, and a called UE, wherein said calling UE is served by a packet switched, PS, core network via a radio access network, RAN, and wherein a bearer is to be established between said calling UE and a gateway node in said PS core network, over said RAN , for obtaining access to an Internet Protocol, I P, multimedia subsystem, I MS, network, wherein said method comprises the steps:

- receiving, by an I MS Call Session Control Function, CSCF, node a notification message thereby notifying said I MS node that said VoI P call establishment is in progress;

enabling, by said I MS CSCF, re-establishment of said bearer between said calling UE and said gateway node, over said RAN, in case said establishment of said bearer has failed due to a temporary failure.

2. A method in accordance with claim 1 , wherein said step of enabling comprises:

providing, by said IMS CSCF, to said gateway node, a list of failure cause codes for which said gateway node is allowed to retry establishment of said bearer.

3. A method in accordance with claim 1 , wherein said step of enabling comprises:

- receiving, by said I MS CSCF, a failure message thereby indicating that said bearer establishment between said calling UE and said gateway node has failed;

determining, by said IMS CSCF, that said failure message comprises an indication that said failure is temporary;

- requesting, by said I MS CSCF, said gateway node, to re-establish said bearer between said calling U E and said gateway node.

4. A method in accordance with claim 1 , wherein said step of enabling comprises:

receiving, by said I MS CSCF, a failure message thereby indicating that said bearer establishment between said calling UE and said gateway node has failed;

determining, by said IMS CSCF, that said failure message comprises an indication that said failure is temporary;

requesting, by said I MS CSCF, said calling UE to either reestablishing said Voice over Internet Protocol, VoI P, call between a calling User Equipment, UE, and said called UE via said radio access network, RAN, or to request said calling UE to re-register to said I MS network.

5. A method in accordance with any of the previous claims, wherein said temporary failure is based on any of

a Radio Access Network, RAN, cause code;

a Non Access Stratum, NAS, cause code;

- a General Packet Radio Service Tunnelling Protocol, GTP, cause code;

a diameter result code.

6. A method of establishing a Voice over Internet Protocol, VoI P, call between a calling User Equipment, UE, and a called UE, wherein said calling UE is served by a packet switched, PS, core network via a radio access network, PS-RAN , and wherein a bearer is to be established between said calling U E and a gateway node in said PS core network, over said RAN, for obtaining access to an Internet Protocol, I P, multimedia subsystem, IMS, network, wherein said method comprises the steps:

- establishing, by said gateway node, said bearer between said calling UE and said gateway node;

determining, by said gateway node, that said bearer establishment has failed due to a temporary failure;

re-establishing, by said gateway node, said bearer between said calling UE and said gateway node.

7. A method in accordance with claim 6, wherein said method further comprises the step of:

receiving, by said gateway node, from an I MS Call Session Control Function, CSCF, node, a list of failure cause codes for which said gateway node is allowed to retry establishment of said bearer;

and wherein said step of determining comprises:

- determining, by said gateway node, that said bearer establishment has failed due to a temporary failure based on said received list of failure cause codes.

8. A method for establishing a Voice over Internet Protocol, VoI P, call between a calling User Equipment, UE, and a called UE, wherein said calling UE is served by a packet switched, PS, core network via a radio access network, RAN , and wherein a bearer is to be established between said calling UE and a gateway node in said PS core network, over said RAN, for obtaining access to an Internet Protocol, I P, multimedia subsystem, I MS, network, wherein said method comprises the steps of:

transmitting, by said calling UE, a request message for requesting establishment of said VoI P call;

receiving, by said calling UE, a service unavailable message indicating that said establishment of said bearer has failed and comprising an indication that said calling UE should retry said establishment of said VoI P call;

re-transmitting, by said calling UE, said request message for requesting establishment of said VoI P call of requesting, by said calling UE, re-registration in said I MS network.

9. An Internet Protocol, I P, Multimedia Subsystem, I MS, Call Session Control Function, CSCF, for supporting establishment of a Voice over Internet

Protocol, VoI P, call between a calling User Equipment, U E, and a called UE, wherein said calling U E is served by a packet switched, PS, core network via a radio access network, RAN, and wherein a bearer is to be established between said calling U E and a gateway node in said PS core network, over said RAN , for obtaining access to said I MS network, wherein said I MS CSCF node comprises:

receive equipment arranged for receiving a notification message thereby notifying said I MS node that said VoI P call establishment is in progress; process equipment arranged for enabling re-establishment of said bearer between said calling UE and said gateway node, over said RAN, in case said establishment of said bearer has failed due to a temporary failure.

10. An I MS CSCF node in accordance with claim 9, wherein said node further comprises:

transmit equipment arranged for providing a list of failure cause codes for which said gateway node is allowed to retry establishment of said bearer.

1 1 . An I MS CSCF node in accordance with claim 9, wherein said process equipment is further arranged for:

receiving a failure message thereby indicating that said bearer establishment between said calling U E and said gateway node has failed;

determining that said failure message comprises an indication that said failure is temporary;

requesting said gateway node, to re-establish said bearer between said calling UE and said gateway node.

12. An I MS CSCF node in accordance with claim 9, wherein said process equipment is further arranged for:

receiving a failure message thereby indicating that said bearer establishment between said calling U E and said gateway node has failed;

determining that said failure message comprises an indication that said failure is temporary;

- requesting said calling UE to re-establishing said Voice over

Internet Protocol, VoI P, call between a calling User Equipment, UE, and said called UE via said radio access network, RAN .

13. An I MS CSCF node in accordance with any of the claims 9 - 12, wherein said temporary failure is based on any of

a Radio Access Network, RAN , cause code;

a Non Access Stratum, NAS, cause code;

a General Packet Radio Service Tunnelling Protocol, GTP, cause code;

a diameter result code.

14. A Calling User Equipment, UE, for establishing a Voice over Internet Protocol, VoI P, call between said calling U E and a called UE, wherein said calling U E is served by a packet switched, PS, core network via a radio access network, RAN , and wherein a bearer is to be established between said calling U E and a gateway node in said PS core network, over said RAN , for obtaining access to an Internet Protocol, I P, multimedia subsystem, I MS, network, wherein said calling U E comprises:

transmit equipment arranged for transmitting a request message for requesting establishment of said VoI P call;

receive equipment arranged for receiving a service unavailable message indicating that said establishment of said bearer has failed and comprising an indication that said calling UE should retry said establishment of said VoI P call;

re-transmit equipment arranged for re-transmitting said request message for requesting establishment of said VoI P call.

15. A gateway node arranged for supporting establishment of a Voice over Internet Protocol, VoI P, call between a calling User Equipment, UE, and a called UE, wherein said calling UE is served by a packet switched, PS, core network via a radio access network, RAN, and wherein a bearer is to be established between said calling U E and said gateway node in said core network, over said RAN , for obtaining access to an Internet Protocol, I P, multimedia subsystem, I MS, network, wherein gateway node comprises:

establish equipment arranged for establishing said bearer between said calling UE and said gateway node;

process equipment arranged for determining that said bearer establishment has failed due to a temporary failure;

re-establish equipment arranged for re-establishing said bearer between said calling UE and said gateway node.

16. A gateway node in accordance with claim 15, wherein said gateway node further comprises:

receive equipment arranged for receiving, from an I MS Call Session Control Function, CSCF, node, a list of failure cause codes for which said gateway node is allowed to retry establishment of said bearer;

and wherein said process equipment is further arranged for determining that said bearer establishment has failed due to a temporary failure based on said received list of failure cause codes.

17. A non-transitory computer-readable storage medium, comprising instructions which , when executed on at least one processor, cause the at least one processor to carry out the method according to any of the claims 1 - 8.