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Back to SBC for WRTC

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Overview

The 

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supports the late media scenarios for Interactive Connectivity Establishment (ICE) and Datagram Transport Layer Security (DTLS). The behavior of late media

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on the 

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is controlled by the flag lateMediaSupport. The possible values of this flag are passthru and convert.

  • For a late media pass-through call, the 
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  •  supports:
    • Sending the ICE-Lite and DTLS related attributes in the Session Description Protocol (SDP) offer in 18x response or 200 Ok response to the ingress leg, when the INVITE is received without SDP.
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    • Sending the ICE-Lite and DTLS related attributes in the SDP answer in PRACK or ACK to the egress leg, when the SDP offer is received in 18x or 200 from the egress leg.
  • For a late media convert call, the 
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  •  supports:
    • Sending the ICE-Lite related attributes in the SDP offer in 18x response or 200 Ok response to the ingress leg, when the INVITE is received without SDP.
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    • Sending the ICE-Lite related attributes in the SDP offer in INVITE request to the egress leg, when the ingress INVITE is received without SDP.
Note
  • DTLS is not supported for late media convert calls.
  • Late media support for ICE and DTLS assumes that the 
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    is configured appropriately for ICE and DTLS termination. For more details on configuration, refer to Configuring SBC for WRTC.

Call Flows

Non PRACK Late Media Pass-through

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1 Non-PRACK Late Media Pass-through Call Flow

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PRACK Late Media Pass-through

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1PRACK Late Media Pass-through Call Flow

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Non-PRACK Late Media Convert

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1Non-PRACK Late Media Convert Call Flow

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PRACK Late Media Convert

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1PRACK Late Media Convert Call Flow

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Note

The MS Lync/Skype Remote Desktop Sharing feature is supported on all

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platforms:

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  • Spacevars
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  • Spacevars
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    (all environments)