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Overview

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supports ICE and DTLS with direct media and anti-trombone scenarios. Any call, which is setup as Direct Media call can become a non-Direct Media call due to call transfer or Re-INVITE.
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supports conversion of a Direct Media call to Non Direct media and vice versa and handles the ICE/DTLS interactions as per the following:

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    supports the direct media call between two devices that support ICE procedures and may use DTLS for media. The ICE procedures, connectivity checks, and DTLS procedures occur directly between the endpoints. The direct media works with early dialog (answer in 18x reliable) and/or 200 Ok.
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    sends the following ICE and DTLS parameters are copied from Ingress SDP and sent in Egress SDP for direct media:
    • ICE parameters
      • ice-ufrag
      • ice-pwd
      • ice-lite
      • ice-mismatch
      • candidate
      • remote-candidates
      • ice-options
      • end-of-candidates
    • DTLS parameters
      • setup (active/passive)
      • fingerprint
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    supports the ICE-Lite procedure for a call when it is reconfigured as non-direct media after setting up as a direct media call initially.

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    does not play any role in the ICE procedures for the transfer of a direct media call (that is connected through an AS) to a direct media call to another party except relaying the SDP parameters.
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    supports reconfiguring a call to direct media with end to end ICE procedures after it is setup as non-direct media call using ICE-Lite procedures.

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    supports the transfer of a non-direct media call that used ICE-Lite to a direct media call to another party by Refer mechanism.

Inter-SBC Direct Media Scenarios

In inter-

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direct media scenario, the call legs are on different
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s.

The following diagram illustrates inter-

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direct media scenario with end to end ICE and DTLS procedure.

The Inter-SBC Direct Media Scenario with End to End ICE and DTLS Procedure

 

Intra-SBC Direct Media Scenarios

In intra-

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direct media scenario, both the call legs are on same
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.

The following diagram illustrates intra-

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direct media scenario with end to end ICE and DTLS procedure.

The Intra-SBC Direct Media Scenario with End to End ICE and DTLS Procedure

  • If both DTLS relay and Direct Media are configured on
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    , Direct Media takes precedence over DTLS relay.
  • A late media with pass-through call can be established as a Direct Media call if Direct Media configuration is enabled.
  • A late media with convert call can be established as a Direct Media call if Direct Media configuration is enabled. However, in this case the first INVITE sent by 
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    Egress side must have locally generated parameters (including local ICE candidates) in the SDP.

Anti-trombone Direct Media

Anti-trombone direct media uses normal direct media on

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facing the endpoints and anti-trombone configuration on the 
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side facing the SIP AS. This feature is useful when x-dmi cannot be passed through the SIP AS. For more information on media anti-trombone, refer to Media Antitrombone.

Anti-trombone Direct Media

ICE Ingress and Egress Compatibility

  • DTLS must be enabled on Ingress and Egress Trunk Groups if required for Direct Media.
  • ICE must be enabled and compatible between Ingress and Egress Trunk Groups for Direct Media ICE calls.

ICE Ingress and Egress Compatibility

Ingress TG ICE ConfigurationEgress TG ICE Configuration


 NONEICE-LYNCICE-WRTCICE-Full
NONEYesNoNoNo
ICE-LYNCNoYesNoNo
ICE-WRTCNoNoYesYes
ICE-FULLNoNoYesYes
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