| 摘要 |
Emergency call backs may be placed to a user device in a manner that bypasses certain features (e.g., call forwarding) that may be enabled by the device. A method may include receiving an emergency call from a user device; and creating, in response to the emergency call, an emergency session associated with the user device, where the creating includes forwarding the call to a public safety access point (PSAP) server that handles emergency calls. The method may further include receiving a call, such as an emergency call back call, destined for the user device; determining that the emergency session has not expired when an elapse time associated with the emergency session is less than a threshold; and forwarding, to the user device, the call, as a return call from the PSAP server, based on the determination that the emergency session has not expired. |
| 主权项 |
1. A method comprising:
receiving, by a server device, an emergency call a first user device, where a user of the first user device has enabled a feature that causes one or more calls, destined for the first user device, to be forwarded to a second user device or not to be forwarded to the first user device, wherein the emergency call is a Session Initiation Session (SIP) call; creating, by the server device and in response to the emergency call, an emergency session associated with the first user device, where the creating includes:
storing, in a memory, a data item that includes a device identifier associated with the first user device, a time at which the emergency call is received from the first user device, and a threshold associated with a time after which the emergency call expires, andforwarding the emergency call to a public safety access point (PSAP) server that handles emergency calls; receiving, by the server device, a second SIP call with identification data; identifying the first user device as a destination to which the second call is directed by accessing the data item, by matching the identification data to the device identifier; determining, by the server device, that the emergency session has not expired when an elapse time associated with the emergency session is less than the threshold; processing, by the server device, the second SIP call as a PSAP callback by sending a notification to an application server to disable the feature that causes one or more calls, destined for the first user device, to be forwarded to a second user device or not to be forwarded to the first user device; and forwarding, by the server device and to the first user device, the second call, as a return call from the PSAP server, based on the disabled feature. |
