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Content for  TS 23.334  Word version:  17.2.0

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6.2.10A IMS end-to-end Media Plane Security  6.2.10A.1 End-to-end security for RTP based media using SDES  6.2.10A.2 End-to-end security for TCP-based media using TLS  6.2.11 Change Through-Connection  6.2.12 Emergency Calls 
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6.2.10A  IMS end-to-end Media Plane Security |R12|  p. 122

6.2.10A.1  End-to-end security for RTP based media using SDES  p. 122

This procedure is identical to that of clause 6.2.1 apart from the IMS-ALG providing "RTP/SAVP" or "RTP/SAVPF", as received in the SDP, to the IMS-AGW as transport protocol and not providing any other media related information to the corresponding terminations, and configuring the IMS-AGW to pass media transparently.
The IMS-ALG shall forward the SDP with unmodified transport protocol for those media lines and unmodified SDES SDP attribute(s).
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6.2.10A.2  End-to-end security for TCP-based media using TLS  p. 122

This procedure is identical to that of clause 6.2.1 apart from the IMS-ALG providing "TCP" to the IMS-AGW as transport protocol and not providing any TLS related information nor any other media related information to the corresponding terminations, and configuring the IMS-AGW to pass media transparently.
The IMS-ALG shall forward the SDP with unmodified transport protocol for those media lines and unmodified TLS related SDP attribute(s).
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6.2.11  Change Through-Connection  p. 122

The Change Through-Connection procedure is used for opening and closing of gates and is mandatory for IMS-ALG and IMS-AGW to support. The IMS-ALG sets the Stream mode parameter using the Change Through-Connection procedure to request the IMS-AGW to one-way or both-way through-connect or block media streams on a termination.
The IMS-ALG may combine the Change Through-Connection procedure with the Reserve and Configure AGW Connection Point, Reserve AGW Connection Point or Configure AGW Connection Point procedure as in Figure 6.2.1.2, or may apply this procedure separately.
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6.2.12  Emergency Calls  p. 122

This procedure is identical to that of clause 6.2.1 apart from the IMS-ALG requesting the IMS-AGW to treat the call as emergency call with a preferential handling by including the information element "Emergency Call Indicator" within the "Reserve and Configure AGW Connection Point" or "Reserve AGW Connection Point procedure".

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