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This section describes the various parameters associated with network-hosted NAT/NAPT traversal for SIP endpoints.

To View and Edit Services

On the 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.

Use the NAT Traversal window to check NAT Traversal settings for each Address Context, Zone and Sip SIP Trunk Group created, or for all Address Contexts, Zones and Sip Trunk Groups created. Use the drop-down boxes lists to select the desired Address Context, Zone and Sip SIP Trunk Group. The Edit NAT Traversal window is displayed.

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1Sip Trunk Group - Services - Nat Traversal
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The following fields are displayed:

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1Sip SIP Trunk Group - Services - Nat NAT Traversal parameters
 

Parameter

Description

Signaling NAT

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

  • disabled (default)
  • enabled

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Media NAT

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

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

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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

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Note

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 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.

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    Note

    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.
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Note

For MS Lync ICE (iceLync setting), keep-alive messages are sent only to RTP port.

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Note

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.

Ice Keepalive Timer

Specifies the keep alive timer in full-ICE and MS-Lync ICE. The value ranges from 0 to 60 seconds and the default value is 15 seconds.

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Note

Ice Keepalive Timer appears only when Ice Support flag is set to Ice Full or Ice Lync.

TCP Keepalive Timer

This NAT TCP keep-alive timer sets the registration refresh rate (in seconds) for SIP over TCP. (default = 240).

UDP Keepalive Timer

This NAT UDP keep-alive timer sets the registration refresh rate (in seconds) for SIP over UDP. (default = 60).

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.
Ice TCP Role

Use this flag to specify if SBC initiates the TCP connection for ICE Lync.The options are:

  • Passive (default): The SBC waits for the peer to initiate the TCP connection. Use this option when working directly with Lync endpoints.
  • Active:  Use this option for the SBC to initiate the TCP connection when connected to internal-facing trunk groups where the peer is not behind the NAT. Also, use this option when working with certain Unified Communication (UC) servers such as Acano which expect the peer to initiate the TCP connection. This is only supported when there are no NATs between the SBC and the UC server.
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Note

Ice TCP Role appears only when Ice Support flag is set to Ice Full or Ice Lync.

Refer to Configuring SBC and LYNC in Media Environment for configuration details.

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