Method, Local Gateway, and System for Local Voice Survivability

1. A method for local voice survivability performed by a local gateway, comprising: detecting, according to a preset detection period, an activity state of each server recorded in a server monitoring list, wherein the server monitoring list records one or more voice servers on an Internet protocol (IP) multimedia subsystem (IMS) network; maintaining a user account and temporary user state information for a user terminal according to user information obtained by monitoring interaction between the user terminal and a server in the server monitoring list, wherein the temporary user state information records a time of a most recent interaction between the user terminal and the server; upon detecting that each server in the server monitoring list is in an unavailable state, enabling a local interception proxy function configured on the local gateway to intercept a service data stream sent by the user terminal to the server; and based on the maintained user account and temporary user state information, providing a corresponding service response for the user terminal according to content of the intercepted service data stream, wherein the preset detection period is set shorter than a checking period set on the user terminal for refreshing registration, so that the local gateway learns prior to the user terminal, that each server on the network is in the unavailable state.

2. The method for local voice survivability according to claim 1 , further comprising: as a result of detecting that any server recorded in the server monitoring list resumes an available state, stopping intercepting the service data stream sent by the user terminal to the server.

3. The method for local voice survivability according to claim 1 , wherein the maintaining the user account and the temporary user state information for the user terminal comprises: deleting the user account and the temporary user state information of the user terminal if no update of the temporary user state information is detected within a preset monitoring period.

4. A system for local voice survivability, comprising: one or more servers; a user terminal; and a local gateway comprising computing hardware configured to: detect, according to a preset detection period, an activity state of each server recorded in a server monitoring list, wherein the server monitoring list records one or more voice servers on an Internet protocol (IP) multimedia subsystem (IMS) network; maintain a user account and temporary user state information for the user terminal according to user information obtained by monitoring interaction between the user terminal and a server in the server monitoring list, wherein the temporary user state information records a time of a most recent interaction between the user terminal and the server; upon detecting that each server in the server monitoring list is in an unavailable state, enable a local interception proxy function configured on the local gateway to intercept the service data stream sent by the user terminal to the server; and based on the maintained user account and temporary user state information, send a corresponding service response to the user terminal according to content of the intercepted service data stream and the user account, wherein the preset detection period is set shorter than a checking period set on the user terminal for refreshing registration, so that the local gateway learns prior to the user terminal, that each server on the network is in the unavailable state.

5. The system according to claim 4 , wherein the local gateway is further configured to, as a result of detecting that any server recorded in the server monitoring list resumes an available state, stop intercepting the service data stream sent by the user terminal to the server.

6. A local gateway, comprising a processor executing a program stored in a computer-readable storage medium and configured to: detect, according to a preset detection period, an activity state of each server recorded in a server monitoring list, wherein the server monitoring list records one or more voice servers on an Internet protocol (IP) multimedia subsystem (IMS) network; maintain a user account and temporary user state information for a user terminal according to user information obtained by monitoring interaction between the user terminal and a server in the server monitoring list, wherein the temporary user state information records a time of a most recent interaction between the user terminal and the server; upon detecting that each server in the server monitoring list is in an unavailable state, enable a local interception proxy function configured on the local gateway to intercept a service data stream sent by the user terminal to the server; and based on the maintained user account and temporary user state information, send a corresponding service response to the user terminal according to content of the intercepted service data stream and the user account, wherein the preset detection period is set shorter than a checking period set on the user terminal for refreshing registration, so that the local gateway learns prior to the user terminal, that each server on the network is in the unavailable state.

7. The local gateway according to claim 6 , wherein the processor is further configured to: stop, as a result of detecting that any server recorded in the server monitoring list resumes an available state, intercepting the service data stream sent by the user terminal.

8. The local gateway according to claim 6 , wherein the processor is further configured to: delete the user account and the temporary user state information of the user terminal if no update of the temporary user state information is detected within a preset monitoring period.