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Content for  TS 24.186  Word version:  18.0.0

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9.4 Abnormal cases  9.4.1 General  9.4.2 No response on DC2 interface  9.4.3 Insufficient data channel resource 
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9.4  Abnormal cases  p. 22

9.4.1  General  p. 22

Abnormal cases on IMS data channel include the following:
  • The IMS AS has sent a data channel resource reservation/update request and does not receive a response to that request.
  • 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.).
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9.4.2  No response on DC2 interface  p. 22

9.4.2.1  Actions at the IMS AS  p. 22

If the IMS AS does not receive a response to a data channel resource reservation/update request, the IMS shall:
  • remove the data channel SDP media description from the SDP offer for the INVITE/re-INVITE request;
  • continue the ongoing session procedure; and
  • set the port number of the "m=" lines for data channel as zero in the SDP answer of the response to the INVITE/re-INVITE request.

9.4.3  Insufficient data channel resource  p. 22

9.4.3.1  Actions at the IMS AS  p. 22

If the IMS AS receives an error response message to a data channel resource reservation/update request, the IMS AS shall:
  • remove the data channel SDP media description from the SDP offer for the INVITE/re-INVITE request;
  • continue the ongoing session procedure; and
  • set the port number of the "m=" lines for data channel as zero in the SDP answer of the response to the INVITE/re-INVITE request.

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