Integrated services user part (ISUP)/session initiation protocol (SIP) gateway for unlicensed mobile access (UMA) emergency services call flow
View Patent ↗An ISUP/SIP gateway is implemented to encapsulate SS7 location requests from a switched telephone network into an Internet protocol SIP message including one or more location objects. The ISUP/SIP gateway is implemented between a mobile switching center (MSC) and a VoIP positioning center (VPC) to provide support of unlicensed mobile access (UMA) voice over Internet Protocol (VoIP) call routing, e.g., for E9-1-1, 4-1-1, 2-1-1, etc. The disclosed location objects that are encapsulated into a SIP message includes calling party number, called party number, CGI, International Mobile Subscriber Identity (IMSI), mobility indicator, and/or access point MAC address. At the SIP/ISUP gateway, SS7 integrated services user part (ISUP) location request messages are encapsulated within SIP. The SIP encapsulated location request message is then routed over the Internet to a destination VoIP positioning center (VPC).
1. A method of providing location based support for an emergency call, comprising:
receiving, at a Session Initiation Protocol (SIP) gateway, a request for geographic location information associated with an unlicensed mobile access (UMA) wireless device initiating an emergency call;
encapsulating, at said SIP gateway, said request in a SIP message; and
retrieving, via said SIP encapsulated request transmitted from said SIP gateway to a voice over Internet protocol (VoIP) positioning center, routing information associated with said emergency call.
2. The method of providing location based support for an emergency call according to claim 1 , wherein:
said emergency call originates at a dual-mode phone.
3. The method of providing location based support for an emergency call according to claim 2 , wherein:
said dual-mode phone is capable of initiating said emergency call via a WiFi network.
4. The method of providing location based support for an emergency call according to claim 1 , wherein said encapsulated request comprises:
a calling party number.
5. The method of providing location based support for an emergency call according to claim 1 , wherein said encapsulated request comprises:
a calling party number; and
a called party number.
6. The method of providing location based support for an emergency call according to claim 1 , wherein said encapsulated request comprises:
an access point MAC address.
7. The method of providing location based support for an emergency call according to claim 1 , wherein said encapsulated request comprises:
calling party number;
called party number; and
access point MAC address.
8. The method of providing location based support for an emergency call according to claim 1 , wherein said encapsulated request comprises:
calling party number; and
called party number;
wherein said request conforms to common gateway interface (CGI).
9. The method of providing location based support for an emergency call according to claim 8 , wherein said encapsulated request further comprises:
an access point MAC address.
10. The method of providing location based support for an emergency call according to claim 1 , wherein said encapsulated request comprises:
calling party number;
called party number; and
International Mobile Subscriber Identity (IMSI).
11. The method of providing location based support for an emergency call according to claim 1 , wherein said encapsulated request comprises:
calling party number; and
mobility indicator.
12. The method of providing location based support for an emergency call according to claim 11 , wherein said encapsulated request further comprises:
an access point MAC address.
13. The method of providing location based support for an emergency call according to claim 1 , wherein said encapsulated request comprises:
calling party number; and
International Mobile Subscriber Identity (IMSI).
14. A Session Initiation Protocol (SIP) gateway for providing location based support for an emergency call, comprising:
a receiver, at a Session Initiation Protocol (SIP) gateway, to receive a request for geographic location information associated with an unlicensed mobile access (UMA) wireless device initiating an emergency call;
an encapsulator, at said SIP gateway, to encapsulate said request in a SIP message; and
a retriever to retrieve, via a voice over Internet protocol (VoIP) positioning center, routing information associated with said emergency call.
15. The Session Initiation Protocol (SIP) gateway for providing location based support for an emergency call according to claim 14 , wherein:
said emergency call originates at a dual-mode phone.
16. The Session Initiation Protocol (SIP) gateway for providing location based support for an emergency call according to claim 15 , wherein:
said dual-mode phone is capable of initiating said call via a WiFi network.
17. The Session Initiation Protocol (SIP) gateway for providing location based support for an emergency call according to claim 14 , wherein said encapsulated request comprises:
a calling party number.
18. The Session Initiation Protocol (SIP) gateway for providing location based support for an emergency call according to claim 14 , wherein said encapsulated request comprises:
a calling party number; and
a called party number.
19. The Session Initiation Protocol (SIP) gateway for providing location based support for an emergency call according to claim 14 , wherein said encapsulated request comprises:
an access point MAC address.
20. The Session Initiation Protocol (SIP) gateway for providing location based support for an emergency call according to claim 14 , wherein said encapsulated request comprises:
calling party number;
called party number; and
access point MAC address.
21. The Session Initiation Protocol (SIP) gateway for providing location based support for an emergency call according to claim 14 , wherein said encapsulated request comprises:
calling party number; and
called party number.
22. The Session Initiation Protocol (SIP) gateway for providing location based support for an emergency call according to claim 21 , wherein said encapsulated request further comprises:
an access point MAC address.
23. The Session Initiation Protocol (SIP) gateway for providing location based support for an emergency call according to claim 14 , wherein said encapsulated request comprises:
calling party number;
called party number; and
International Mobile Subscriber Identity (IMSI).
24. The Session Initiation Protocol (SIP) gateway for providing location based support for an emergency call according to claim 14 , wherein said encapsulated request comprises:
calling party number; and
mobility indicator.
25. The Session Initiation Protocol (SIP) gateway for providing location based support for an emergency call according to claim 24 , wherein said encapsulated request further comprises:
an access point MAC address.
26. The Session Initiation Protocol (SIP) gateway for providing location based support for an emergency call according to claim 14 , wherein said encapsulated request comprises:
calling party number; and
International Mobile Subscriber Identity (IMSI).