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Parameter	Description
Signaling NAT	Indicates whether or not NAT/NAPT support is required for signaling.  disabled Disabled (default) enabledEnabled Include Page No_NAT_for_IPv6 No_NAT_for_IPv6
Media NAT	Specifies the whether or not NAT/NAPT support is required for media.  disabled Disabled (default)  enabledEnabled Info title Panel #fffdf6 borderColor #fff2cc bgColor Note Do not configure Media NAT and Ice Support flags flags on the same Trunk Grouptrunk group. Include Page No_NAT_for_IPv6 No_NAT_for_IPv6
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 Disabled (default)  enabledEnabled Panelinfo borderColor #fff2cc bgColor #fffdf6 title Note 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 - This setting is used when inter-working with WebRTC gatewaysWebrtc Gateways, for example the  Spacevars 0 company WRTC gateway the Sonus WRTC Gateway or in situations when the SBC is presented with an ICE SDP from a WebRTC Enabled Endpoint-enabled endpoint. panel Info
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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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For MS Lync ICE (iceLync Ice Lync setting), keep-alive messages are sent only to the RTP port.

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

Warning
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 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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The Ice Keepalive Timer appears only when when the 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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Ice TCP Role appears only when the Ice Support flag is set to Ice Full or Ice Lync.

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