Recovery techniques in mobile networks
View Patent ↗A technique for protecting location information of a subscriber in a mobile network is disclosed. A User Mobility Server (UMS) receives a first query from a first call state control function (CSCF). The UMS transmits a call setup and a subscriber identity to a servicing-call state control function (S-CSCF). The S-CSCF may have no record of the subscriber identity due to a restart are some other event. The UMS receives a second query from the S-CSCF based in part of the subscriber identity. The UMS transmits a home address of a mobile station to the S-CSCF. The UMS may also transmit a profile download to the S-CSCF.
1. A method comprising:
receiving a call for a subscriber at a first server, wherein the call for the subscriber comprises a dialed alias;
sending a route request from the first server to a mobile server, wherein the route request includes the dialed alias;
receiving a response at the first server from the mobile server, wherein the response comprises an address of a second server and a subscriber identity; and
sending a call setup request from the first server to the second server, wherein the call setup request comprises the subscriber identity and the dialed alias.
2. The method of claim 1 , wherein the first server comprises an Interrogating-Call State Control Function (I-CSCF).
3. The method of claim 1 , wherein the second server comprises a Server-Call State Control Function (S-CSCF).
4. The method of claim 1 , wherein the sending a route request comprising querying the mobile server based on the dialed alias of the subscriber.
5. The method of claim 1 , further comprising receiving an identity of the subscriber at the first server from the mobile server.
6. The method of claim 1 , wherein sending a route request comprises querying the mobile server based on the dialed alias.
7. A system comprising:
a first server configured to:
receive a call for a subscriber, wherein the call for the subscriber comprises a dialed alias;
send a first route request to a mobile server, wherein the first route request includes the dialed alias;
receive a response from the mobile server, wherein the response comprises an address of a second server and a subscriber identity; and
send a call setup request to the second server, wherein the call setup request comprises the subscriber identity and the dialed alias.
8. The system of claim 7 , wherein the second server is configured to:
receive the call setup request for the subscriber;
send a second route request to a mobile server, wherein the route request comprises the subscriber identity;
receive a home address of the subscriber from the mobile server; and
send the call setup request to a home agent at the home address of the subscriber.
9. The system of claim 8 , wherein the first server is further configured to query the mobile server based on an alias of the subscriber which was dialed by a party that sent the call.
10. The system of claim 8 , wherein the first server is further configured to receive an identity of the subscriber from the mobile server.
11. The system of claim 8 , wherein the call setup request includes the identity of the subscriber.
12. The system of claim 8 , wherein the second server is further configured to query the mobile server based on the identity of the subscriber.
13. The system of claim 8 , wherein the second server is further configured to send the call setup request to a care of address of the subscriber.