The
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supports ICE and DTLS with direct media and 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:
- 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.
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
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
Antitrombone direct media uses normal direct media on the
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facing the endpoints and 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, refer to
Media Antitrombone.
Antitrombone Direct Media
- 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 Configuration | Egress TG ICE Configuration |
---|
| NONE | ICE-LYNC | ICE-WRTC | ICE-Full |
NONE | Yes | No | No | No |
ICE-LYNC | No | Yes | No | No |
ICE-WRTC | No | No | Yes | Yes |
ICE-FULL | No | No | Yes | Yes |
Inter SBC Direct Media Call Flow
Intra SBC Direct Media Call Flow
Antitrombone Direct Media Call Flow
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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