Abnormal cases on IMS data channel include the following:
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The IMS AS has sent a data channel resource reservation/update request and does not receive a response to that request.
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The IMS AS has sent a data channel resource reservation/update request, and receives an error response to that request due to no sufficient data channel resource.
The failures during IMS data channel establishment and maintenance shall not impact any other ongoing media which are associated with the same IMS session (e.g. audio, video, etc.).