SIP Configuration for Remote Symmetric NAT Traversal

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Applies to version(s): v3.0, v3.1

It is assumed that a SIP NAP or a SIP Open NAP has been created and allocated.

To configure a Remote Symmetric NAT Traversal

1. Select NAPs in the Navigation Panel:
NAP NavigationMenu.png

2. Select an existing SIP NAP in the list:
EnableSipISipT 1.png

3. Click Network Address Translation (NAT):
Configuring remote or local nat traversal.jpg


4. SBC/Tmedia can be configured for RTP messages traversing a remote NAT as follows:

  • None: Remote device is not behind a NAT or remote NAT device is SIP/RTP aware.
  • Force Passive Mode: Uses IP address and port from first received RTP packet to start sending RTP packets.
  • Parse Direction Attribute: Uses "Passive Mode" only when "a=direction:active" is received in the SDP.

Select the appropriate method for RTP NAT Traversal.

Selecting remote method for rtp nat traversal.jpg

5. SBC/Tmedia can be configured for SIP messages traversing a remote NAT as follows:

  • None: Remote device is not behind a NAT, or reports SIP headers (contact, via) that are directly reachable.
  • Automatic NAT Traversal: Automatically detects if the device is behind a NAT. This method parses the Contact IP address of the packet and check if it corresponds to a private/reserved IP range. In that case, SIP messages will be sent to the IP/Port seen in the IP header rather than the SIP headers.
  • Force Use of Public IP and Port: Uses the IP and port from the IP header of the last received SIP packet.

Select the appropriate method for SIP NAT traversal.

Selecting remote method for sip nat traversal.jpg

6. Click Save.

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