CLAIMS
What is claimed is:
1. A method by a User Equipment (UE) for using emergency information,
comprising:
transmitting a request message as part of a Network Access Stratum (NAS) procedure;
receiving, in response to the request message, a response message comprising a list of at least one emergency number;
determining that a dialed number matches the at least one emergency number;
when determining that the dialed number matches the at least one emergency number, selecting a domain to perform a call setup procedure, wherein the call setup procedure comprises at least one of a basic call setup procedure and an emergency call setup procedure;
when the selected domain is a Packet Switched (PS) domain, performing an emergency call setup procedure; and
when the selected domain is a Circuit Switched (CS) domain, performing a basic call setup procedure.
2. The method of claim 1, wherein the response message includes a first information element (IE), the first IE comprising the list of at least one emergency number.
3. The method of claim 2, wherein the first IE does not include a category for the at least one emergency number.
4. The method of claim 2, wherein the response message includes a second IE comprising an Emergency Number List IE, wherein the first IE and the second IE are different.
5. The method of claim 4, wherein the second IE comprises a category.

6. The method of claim 1, wherein the list comprises an indication to perform the emergency call setup procedure only when the PS domain is selected.
7. The method of claim 1, wherein the list comprises an indication to perform the basic call setup procedure when the CS domain is selected.
8. The method of claim 1, wherein the NAS procedure comprises at least one of an attachment procedure, a tracking area update procedure, and a registration procedure.
9. The method of claim 1, wherein the request message is at least one of a registration request to register, a request to update location information, or a request to update tracking area information.
10. The method of claim 1, wherein the basic call setup procedure comprises sending a SETUP message with the emergency number.
11. The method of claim 1, wherein the list comprises, for each of the at least one emergency number, information from which to derive an emergency Universal Resource Name (URN).
12. The method of claim 11, wherein the emergency call setup procedure comprises sending an INVITE message with the emergency URN.
13. The method of claim 1, wherein the NAS procedure comprises a procedure with a mobility management network element.

14. A User Equipment (UE) comprising:
a processor; and
a communications subsystem; wherein the processor and the communications subsystem cooperate to:
transmit a request message as part of a Network Access Stratum (NAS) procedure;
receive, in response to the request message, a response message comprising a list of at least one emergency number;
determine that a dialed number matches the at least one emergency number;
when determining that the dialed number matches the at least one emergency number, select a domain to perform a call setup procedure, wherein the call setup procedure comprises at least one of a basic call setup procedure and an emergency call setup procedure;
when the selected domain is a Packet Switched (PS) domain, perform an emergency call setup procedure; and
when the selected domain is a Circuit Switched (CS) domain, perform a basic call setup procedure.
15. The UE of claim 14, wherein the response message includes a first information element (IE), the first IE comprising the list of at least one emergency number.
16. The UE of claim 15, wherein the first IE does not include a category for the at least one emergency number.
17. The UE of claim 15, wherein the response message includes a second IE comprising an Emergency Number List IE, wherein the first IE and the second IE are different.
18. The method of claim 17, wherein the second IE comprises a category.
19. The UE of claim 14, wherein the list comprises an indication to perform the emergency call setup procedure only when the PS domain is selected.

20. The UE of claim 14, wherein the list comprises an indication to perform the basic call setup procedure when the CS domain is selected.
21. The UE of claim 14, wherein the NAS procedure comprises at least one of an attachment procedure, a tracking area update procedure, and a registration procedure.
22. The UE of claim 14, wherein the request message is at least one of a registration request to register, a request to update location information, or a request to update tracking area information.
23. The UE of claim 14, wherein the basic call setup procedure comprises sending a SETUP message with the emergency number.
24. The UE of claim 14, wherein the list comprises, for each of the at least one emergency number, information from which to derive an emergency Universal Resource Name (URN).
25. The UE of claim 24, wherein the emergency call setup procedure comprises sending an INVITE message with the emergency URN.
26. The UE of claim 14, wherein the NAS procedure comprises a procedure with a mobility management network element.

27. A non-transitory computer readable medium having stored thereon executable code for execution by a processor of a User Equipment (UE), the executable code comprising instructions for:
transmitting a request message as part of a Network Access Stratum (NAS) procedure;
receiving, in response to the request message, a response message comprising a list of at least one emergency number;
determining that a dialed number matches the at least one emergency number;
when determining that the dialed number matches the at least one emergency number, selecting a domain to perform a call setup procedure, wherein the call setup procedure comprises at least one of a basic call setup procedure and an emergency call setup procedure;
when the selected domain is a Packet Switched (PS) domain, performing an emergency call setup procedure; and
when the selected domain is a Circuit Switched (CS) domain, performing a basic call setup procedure.