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The NAT Direct Media Group is a collection of public signaling IP addresses for NAT devices supporting Direct Media (DM). A NAT Direct Media Group name can be maximum of 32 characters; however. However, "0.0.0.0" (IPv4) and "::0" (IPv6) are not allowed.

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To allow Direct Media between NAT devices, or between NAT and Non-NAT devices, the following configuration is necessary.

• Enable directMediaAllowedBehindNAPT and DM flags at the Trunk Group level.
• For Direct Media between endpoints behind same NAT, ensure the signaling IPs of the endpoints match.
• For Direct Media across NAT devices, or from NAT to Non-NAT (Hybrid Networks), configure/group the Signaling IPs of the NAT or Non-NAT device (for Hybrid networks) in the new NAT Direct Media Group table at the Address Context level.

Direct Media is disallowed under following conditions:

• One or both endpoints are behind NAT and directMediaAllowedBehindNAPT flag is disabled.
• If directMediaAllowedBehindNAPT flag is enabled and Signaling IPs of the NAT devices do not match.
• Signaling IPs of the NAT or Non-NAT (for Hybrid Networks) devices are not grouped in the same NAT Direct Media Group Table.
• Address Context name of both endpoints do not match.
• If the call is a Lawful Intercept call.

• Configuring Direct Media Between Endpoints Behind Same NAT
• Configuring Direct Media Between Endpoints Behind Different NAT
• Configuring Direct Media Between Endpoints Behind NAT and Non-NAT Endpoint

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Configuration for Direct Media Between Endpoints Behind Same NAT Configuration for Direct Media Between Endpoints Behind Same NAT

Configuring Direct Media Between Endpoints Behind the Same NAT

ACCESS SIDE:

• At Sip Trunk Group Level
  • directMediaAllowed enabled
  • directMediaAllowedBehindNat enabled
• At Packet Service Profile Level
  •  useDirectMedia enabled

CORE SIDE (towards Application Server):

• At IPSP Level
  • sendDirectMediaInfoInSdpAttribute enabled
• At Packet Service Profile Level
  • useDirectMedia enabled

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Configuration for Direct Media Between Endpoints Behind Different NAT Configuration for Direct Media Between Endpoints Behind Different NAT

Configuring Direct Media Between Endpoints Behind the Different NAT

 ACCESS SIDE:

• At Sip Trunk Group Level
  • directMediaAllowed enabled
  • directMediaAllowedBehindNat enabled
  • sdpTransparencyState disabled

• At Packet Service Profile Level
  • useDirectMedia enabled

CORE SIDE (towards Application Server):

• At IPSP Level
  • sendDirectMediaInfoInSdpAttribute enabled
• At Packet Service Profile Level
  • useDirectMedia enabled

• At Address Context Level
  • Creating the table dmNatPrefix on addressContext
  • Adding the signaling IP Address of NAT Box, which can have direct media among them.

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Configuration for Direct Media Between Endpoints Behind NAT and Non-NAT Endpoint Configuration for Direct Media Between Endpoints Behind NAT and Non-NAT Endpoint

Configuring Direct Media Between Endpoints Behind the NAT and Non-NAT Endpoint

This is an occasional scenario where an endpoint behind NAT can have Direct Media with endpoint not behind NAT. However, if such a case exists, SBC exchanges the media IPs of such devices, while the actual exchange of media depends on the network.

ACCESS SIDE:

• At Sip Trunk Group Level
  • directMediaAllowed enabled
  • directMediaAllowedBehindNat enabled
  • sdpTransparencyState disabled
• At Packet Service Profile Level
  • useDirectMedia enabled

CORE SIDE (towards Application Server):

• At IPSP Level
  • sendDirectMediaInfoInSdpAttribute enabled

• At Packet Service Profile Level
  • useDirectMedia enabled

• At Address Context Level:
  • Creating dmNatPrefix on addressContext
  • Adding signaling IP Address of,
    
    • NAT Box
    • Endpoint signaling IP not behind NAT.

The CLI syntax to enable Direct Media with NAPT on trunk group is the following:

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A flow diagram of this behavior is depicted in the figure below. Please see CLI Command Reference Guide for command details and examples.

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% set addressContext default zone ZONE1 sipTrunkGroup PERFIPS_SBX_INT media sdpAttributesSelectiveRelay enabled 

For command details, see sipTrunkGroup media SIP Trunk Group - Media - CLI or SIP Trunk Group - Media (EMA) page.

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