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This section helps you to understand the various parameters associated with network-hosted NAT/NAPT traversal for SIP endpoints.

To View and Edit Services

On SBC main screen, go to Configuration > System Provisioning > Category: Trunk Provisioning > Trunk Group > Sip Trunk Group > Services > Nat Traversal. The Nat Traversal window is displayed.

The Nat Traversal can be checked for each Address Context, for each Zone, for each Sip Trunk Group created or for all the Address Contexts, Zones and Sip Trunk Groups created. Use the drop-down box to select the desired Address Context, Zone and Sip Trunk Group.

The Edit Nat Traversal window is displayed.

Sip Trunk Group - Services - Nat Traversal

 

The following fields are displayed:

Sip Trunk Group - Services - Nat Traversal parameters

Parameter

Description

Signaling Nat

Indicates whether or not NAT/NAPT support is required for signaling. 

  • disabled (default)
  • enabled

Media Nat

Specifies the whether or not NAT/NAPT support is required for media. 
  • disabled (default) 
  • enabled

Do not configure Media Nat and Ice Support flags on the same Trunk Group.


Learn Nat For Rtp Only

Enable flag to learn media NAT from the first RTP packet only. If disabled, media NAT is learned from any first packet received. For egress trunk groups, this flag is applicable only if Dynamic LRBT flag is disabled. If Dynamic LRBT is enabled, NAPT learning occurs on arrival of RTP packet until the call is connected, at which point Learn Nat For Rtp Only applies even for egress Trunk Groups. The options are:

  • disabled (default) 

  • enabled

The action of this flag does not apply to ICE Nat traversal.

Ice Support

This parameter indicates the type of ICE method used for STUN packet check. The three values are:

  • Ice Webrtc - This setting is used when inter-working with Webrtc Gateways, for example the Sonus WRTC Gateway or in situations when the SBC is presented with an ICE SDP from a WebRTC Enabled Endpoint.

    When configured for this mode, SBC acts as a generic ICE-Lite agent.

  • Ice Lync - This is used when inter-working with a Microsoft Lync 2010 or 2013 client.
  • Ice Full - This is used when inter-working with a full ICE client which requires a STUN connectivity check to be generated by the SBC in response to its own STUN connectivity check.

The "Ice Full" implementation is for lab use only in 5.0.0 release.

NOTE: Sonus recommends to avoid configuring both Media Nat and ICE Support on the same Trunk Group because these configurations are independent mechanisms for solving NAT traversal issues. Because of of this, these configurations should not coexist on the same Trunk Group.

 

The parameter, Learn Nat For Rtp Only, does not apply to ICE and should not be enabled for the Trunk Group with ICE Support enabled.

Refer to SDP Support for a detailed description on Ice Support.

Tcp Keepalive Timer

 Specifies the NAT keepalive timer (in seconds) for SIP over TCP. The value ranges from 15 to 65535 seconds and the default value is 240 seconds. 

Udp Keepalive Timer

 Specifies the NAT keepalive timer (in seconds) for SIP over UDP. The value ranges from 15 to 65535 seconds and the default value is 60 seconds. 

Outbound Tcp Keepalive Timer

Specifies the NAT outbound keepalive timer (in seconds) for SIP over TCP. The value ranges from 0 to 32767 and the default value is 240. 

Outbound Udp Keepalive Timer

Specifies the NAT outbound keepalive timer (in seconds) for SIP over UDP. The value ranges from 0 to 32767and the default value is 60. 

Secure Media Nat Prefix

Use this parameter to match up to 'N' bits of the network IPv4 address obtained from signaling. If set to "0", feature is disabled, and no match of network IP address will occur.  The value ranges from 0 to 32 and the default value is 0.

Make the required changes and click Save at the right hand bottom of the panel to save the changes made.

 

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