Emergency call handling within IP multimedia system (IMS) networks
AssigneeT-Mobile USA, Inc.
InventorsMayank Kaul, Shujaur Rehman Mufti
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Abstract
Systems and methods are described herein for handling E911 communications within IMS networks, such as Voice over LTE (VoLTE) networks. In some embodiments, the systems and methods, via various communication nodes, handle or otherwise govern emergency calls within the VoLTE network, by sending an INVITE message from a sender node of the VoLTE network to a recipient node of the VoLTE network, and starting a retry timer at the sender node that is specific to handling E911 calls by the VoLTE network.
Claims14
A method for handling emergency calls within a Voice over LTE (VoLTE) network, the method comprising:
- sending an INVITE message from a sender node of the VoLTE network to a recipient node of the VoLTE network,
- wherein the INVITE message is based on an E911 call being placed by a user of a mobile device connected to the VoLTE network;
- starting a retry timer at the sender node,
- wherein a duration of the retry timer is specific to handling E911 calls by the VoLTE network and specific to handling INVITE messages between the sender node and the recipient node;
- and
- when an acknowledgement message is received by the sender node from the recipient node within the duration of the retry timer, provisioning the recipient node to handle the E911 call placed by the user of the mobile device;
- and
- when an acknowledgement message is not received by the sender node from the recipient node within the duration of the retry timer, sending another INVITE message from the sender node to a different recipient node of the VoLTE network.
A non-transitory computer-readable medium whose contents, when executed by a computing system of a Voice over LTE (VoLTE) network, cause the computing system to perform a method for handling emergency calls within the VoLTE network, the method comprising:
- sending an INVITE message from a sender node of the VoLTE network to a recipient node of the VoLTE network,
- wherein the INVITE message is based on an E911 call being placed by a user of a mobile device connected to the VoLTE network;
- starting a retry timer at the sender node that is specific to handling E911 calls by the VoLTE network;
- and
- when an acknowledgement message is received by the sender node from the recipient node before the retry timer ends, provisioning the recipient node to handle the E911 call placed by the user of the mobile device;
- and
- when an acknowledgement message is not received by the sender node from the recipient node before the retry timer ends, sending another INVITE message from the sender node to a different recipient node of the VoLTE network.
Dependencies are inferred from the claim text.