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Use the NAT Traversal window to configure NAT traversal settings for SIP trunk groups. This section describes the various parameters associated with network-hosted NAT/NAPT traversal for SIP endpoints. To View and Edit NAT Traversal ParametersOn the SBC main screen, go to Configuration > System Provisioning > Category: Trunk Provisioning > Trunk Group > SIP Trunk Group > Services > NAT Traversal. The NAT Traversal window displays. Use the drop-down lists to select the desired Address Context, Zone and SIP Trunk Group. The Edit NAT Traversal window displays.
Use Reference the following parameters table to configure when configuring the NAT traversal settings for the trunk group, and then click Save. Parameter | Length/Range | Description |
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Signaling NAT
| | Indicates whether or not NAT/NAPT support is required for signaling. - Disabled (default)
- Enabled
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| _No_NAT_for_IPv6 |
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| _No_NAT_for_IPv6 |
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| Media NAT
| | Specifies whether or not NAT/NAPT support is required for media. - Disabled (default)
- Enabled
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| Do not configure Media NAT and Ice Support flags on the same trunk group. |
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| _No_NAT_for_IPv6 |
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| _No_NAT_for_IPv6 |
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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 applies even for egress Trunk Groups. The options are: Disabled (default) Enabled
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| The action of this flag does not apply to ICE NAT traversal. |
| | Ice Support | | This parameter indicates the type of Interactive Connectivity Establishment (ICE) method used for STUN packet check. The values are: Ice Webrtc – Use this setting when inter-working interworking with Webrtc WebRTC Gateways, ; for example, with the Ribbon WRTC WebRTC Gateway or in situations when the SBC is presented with an ICE SDP from a WebRTC-enabled endpoint.
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| When configured for this mode, the SBC acts as a generic ICE-Lite agent. |
- 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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| The parameter, Learn NAT For Rtp Only, does not apply to ICE and should not be enabled for a Trunk Group with ICE Support enabled. |
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The SBC's ICE support capability is not supported for GW-GW call scenarios. |
Refer to SDP Support for a detailed description on Ice Support. | | Ice Trickle | |
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| MultiExcerptName | Trickle ICE definition |
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| Trickle ICE is a mechanism that allows ICE agents to shorten session establishment delays by making the candidate gathering and connectivity checking phases of ICE non-blocking and by issuing them in parallel. This allows starting the call setup procedure to the SBC before all candidates have been gathered by the user agent so that additional candidates can be sent to the SBC in subsequent INFO and/or offer and answer messages. |
Use this flag to enable Trickle ICE support for this trunk group. - Disabled (default)
- Enabled
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| _Trickle_Ice_Warning |
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| _Trickle_Ice_Warning |
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| TCP Keepalive Timer
| 15-65535 | This NAT TCP keep-alive timer sets the registration refresh rate (in seconds) for SIP over TCP. (default = 240). | UDP Keepalive Timer
| 15-65535 | This NAT UDP keep-alive timer sets the registration refresh rate (in seconds) for SIP over UDP. (default = 60). | Outbound TCP Keepalive Timer
| 0-32767 | The 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.for SIP outbound-supported UAs (RFC 5626). (default = 240) | Outbound UDP Keepalive Timer
| 0-32767 | The Specifies the NAT outbound keepalive timer (in seconds) for SIP over UDP . The value ranges from 0 to 32767and the default value is 60.for SIP outbound-supported UAs (RFC 5626). (default = 60) | Secure Media NAT Prefix
| 0-32 | 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.(default = 0) | | Disable Media NAT If Same Media And Sig IP | N/A | Enable this flag to disable Media NAT if Media and Signaling IP addresses are identical. This setting is disabled by default. The options are: - Disabled (default)
- Enabled
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