CELLULAR CONNECTIVITY FOLLOWING A VOLTE CONNECTIVITY FAILURE
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United States of America Patent
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Dec 14, 2015
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Dec 14, 2015
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Abstract
A communication system and method of providing cellular connectivity in a vehicle using the communication system. The method includes the steps of: registering a telematics unit in the vehicle with an internet protocol (IP) multimedia subsystem (IMS) in a cellular network; using the telematics unit, attempting to establish a voice-over long-term evolution (VoLTE) connection via the IMS with an endpoint device; in response to the attempt, receiving an indication of a connectivity issue; and in response to receiving the indication, automatically attempting to de-register with the IMS.
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