| Signalling requirements for IP multimedia subsystem (IMS) emergency call in support of multiple access |
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Supplement 72 to the ITU-T Q-series Recommendations specifies the signalling requirements for Internet protocol (IP) multimedia subsystem (IMS) emergency call in support of multiple access types, including fixed broadband, wireless fidelity (Wi-Fi), fourth generation (4G) and fifth generation (5G) networks.
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