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Overview

The 

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 

• 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

• ICE-Lite procedure for a call when it is reconfigured as non-direct media after setting up as a direct media call initially.

• 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.

Inter-SBC Direct Media Scenarios

In inter-

The following diagram illustrates inter-

Intra-SBC Direct Media Scenarios

In intra-

The following diagram illustrates intra-

Antitrombone Direct Media

Antitrombone direct media uses normal direct media on the 

antitrombone configuration on the 

, refer to Media Antitrombone.

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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Call Flows

Inter-SBC Direct Media

Intra-SBC Direct Media

Antitrombone Direct Media