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1. (WO2017001640) SYSTÈME DE COMMUNICATION
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

Claims

1. A communication entity comprising a Proxy Call Session Control Function, P-CSCF, the P-CSCF comprising:

a transceiver and a controller;

wherein the transceiver is operable:

to receive a register request from a user equipment, UE, in a visited public land mobile network, VPLMN; and

wherein the controller is operable:

to retrieve a network identifier, PLMN ID, for the VPLMN;

to query a database for any local emergency number(s); and

to include the PLMN ID for the VPLMN in a header and forward the register request to a Serving Call Session Control Function, S- CSCF.

2. A communication entity according to claim 1 wherein the transceiver is further operable:

to receive an invite for a non UE detectable emergency call from the, UE, in the VPLMN; and

the controller is further operable:

to detect that said call is an emergency call by performing a comparison of an identifier associated with said call with at least one local emergency number.

3. A communication entity according to claim 1 or 2 wherein the controller is further operable to obtain the PLMN ID from a policy control rule function.

4. A communication entity according to claim 1 , 2 or 3 wherein the controller is further operable to store the PLMN ID.

5. A communication entity according to claim 1 , 2 or 3 wherein the controller is further operable to include the PLMN ID in a further register request message and to control the transceiver to send the further register request message to a node of an IP multimedia core network subsystem, IMS.

6. A communication entity comprising a Proxy Call Session Control Function, P-CSCF, the P-CSCF comprising:

a transceiver and a controller;

wherein the transceiver is operable:

to receive an invite for a non UE detectable emergency call from a user equipment, UE, in a visited public land mobile network, VPLMN; and

wherein the controller is operable:

to detect that said call is an emergency call by performing a comparison of an identifier associated with said call with at least one local emergency numbers.

7. A communication entity according to claim 6 wherein, following detection that said call is an emergency call, the controller is operable to reject said invite.

8. A communication entity according to claim 7 wherein the controller is operable, when rejecting said invite, to control the transceiver to respond to the UE with information indicating a different action (e.g. information identifying a local P-CSCF address for an unauthorised emergency call).

9. A communication entity according to claim 6 wherein, following detection that said call is an emergency call, the controller is operable to route the call, to the correct destination, via a further call session control function (e.g. by forwarding said invite to the further call session control function).

10. A communication entity according to any of claims 6 to 9 wherein said invite is a session initiation protocol, SIP, invite.

1 1. A communication entity according to any of claims 6 to 10 wherein the transceiver is further operable:

to receive a register request from the UE in the VPLMN; and

wherein the controller is further operable:

to retrieve a network identifier, VPLMN ID, for the VPLMN;

to query a database for local emergency numbers; and

to include the VPLMN ID in a header and forward the register request to a Serving Call Session Control Function, S-CSCF.

12. A communication entity according to any of claims 1 to 5 or 1 1 wherein said register request is a session initiation protocol, SIP, resister request.

13. A communication entity comprising a Proxy Call Session Control Function, P-CSCF, the P-CSCF comprising:

a transceiver and a controller;

wherein the transceiver is operable:

to receive a register request from a user equipment, UE, in a visited public land mobile network, VPLMN; and

wherein the controller is operable:

to obtain a network identifier, PLMN ID, for the VPLMN from a policy control rule function; and

to include the PLMN ID in a further register request message and to control the transceiver to send the further register request message to a node of an IP multimedia core network subsystem, IMS.

14. A method performed by a communication entity comprising a Proxy Call Session Control Function, P-CSCF, the method comprising:

receiving a register request from a user equipment, UE, in a visited public land mobile network, VPLMN;

retrieving a network identifier, PLMN ID, for the VPLMN;

querying a database for any local emergency number(s); and

including the PLMN ID for the VPLMN in a header and forwarding the register request to a Serving Call Session Control Function, S-CSCF.

15. A method according to claim 14 further comprising obtaining the PLMN ID from a policy control rule function.

16. A method according to claim 14 or 15 further comprising storing the PLMN ID.

17. A method according to claim 14, 15 or 16 further comprising including the PLMN ID in a further register request message and sending the further register request message to a node of an IP multimedia core network subsystem, IMS.

18. A method performed by a communication entity comprising a Proxy Call Session Control Function, P-CSCF, the method comprising:

receiving an invite for a non UE detectable emergency call from a user equipment, UE, in a visited public land mobile network, VPLMN; and

detecting that said call is an emergency call by performing a comparison of an identifier associated with said call with at least one local emergency numbers.

19. A method performed by a communication entity comprising a Proxy Call Session Control Function, P-CSCF, the method comprising:

receiving a register request from a user equipment, UE, in a visited public land mobile network, VPLMN;

obtaining a network identifier, PLMN ID, for the VPLMN from a policy control rule function; and

including the PLMN ID in a further register request message and sending the further register request message to a node of an IP multimedia core network subsystem, IMS.

A computer implementable instructions product comprising computer implementable instructions for causing a programmable communications device to perform the method of any of claims 14 to 19.