Page History

Signaling Nat


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

• disabled (default)
• enabled

Media Nat


• disabled (default) 
• enabled

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

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.

  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.

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

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.

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 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.

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