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Back to Table of Contents 

Back to SBC for WRTC

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In this section:

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Related articles:

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Overview

The 

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supports ICE and DTLS with direct media and

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antitrombone scenarios. Any call, which is setup as Direct Media call can become a non-Direct Media call due to call transfer or Re-INVITE. The 

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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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  • 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. The 
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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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  • 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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...

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  • 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.

  • Transferring a non-direct media call that used ICE-Lite to a direct media call to another party by Refer mechanism.

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Note

The 

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 does not play any role in the ICE procedures for the transfer of a

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direct media call

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(that is connected through an AS) to a direct media call to another party

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except relaying the SDP parameters.

 

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.

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1The Inter-SBC Direct Media Scenario with End to End ICE and DTLS Procedure

 Image Modified

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.

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1The Intra-SBC Direct Media Scenario with End to End ICE and DTLS Procedure

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Note
  • 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

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  • by the 
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    , the Egress side must have locally generated parameters (including local ICE candidates) in the SDP.

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Antitrombone Direct Media

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Antitrombone direct media uses normal direct media on the 

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facing the endpoints and

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antitrombone 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

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, refer to Media Antitrombone.

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1

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Antitrombone Direct Media

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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.
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1ICE Ingress and Egress Compatibility
Ingress TG ICE ConfigurationEgress TG ICE Configuration


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

When a call is established as an ICE direct media call, the

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does not support media handling. Therefore, the existing CDR fields are populated for Ingress and Egress local Ip address/ports as 255.255.255.255/65535 and Ingress and Egress remote IP address/ports as 127.0.0.0/5004 for each of the media streams on the call. For more information, refer to the section CDR Field Descriptions.

Call Flows

Inter-SBC Direct Media

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1Inter SBC Direct Media Call Flow

 Image Added

Intra-SBC Direct Media

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1Intra SBC Direct Media Call Flow

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Antitrombone Direct Media

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1Antitrombone Direct Media Call Flow

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SIP UA—IP Phone/PBX
SIP Server—PBX/Softswitch
Dialogx— Number of the dialog
IP—IP address in C line
SBCIP—IP address in Cline of the

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Note

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

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platforms:

  • SBC 5000 series
  • SBC 7000
  • SWe (all environments)