# Local NAT Traversal

It is assumed, that a [SIP NAP](https://prosbcdocs.telcobridges.com/configuration-details/configuration-by-web-portal-category/network-access-points-nap) or a [SIP Open NAP](https://prosbcdocs.telcobridges.com/configuration-details/configuration-by-web-portal-category/network-access-points-nap/allocating-a-sip-open-network-access-point-nap) has already been created and is allocated.\ <br>

### To configure a Local Symmetric NAT Traversal

1\. Select NAPs in the Navigation Panel:

<figure><img src="https://docs.telcobridges.com/w/images/3/38/NAP_NavigationMenu.png" alt=""><figcaption></figcaption></figure>

2\. Select an existing SIP NAP in the list:<br>

<figure><img src="https://docs.telcobridges.com/w/images/e/e2/EnableSipISipT_1.png" alt=""><figcaption></figcaption></figure>

3\. Click Network Address Translation (NAT):<br>

<figure><img src="https://docs.telcobridges.com/w/images/thumb/f/fa/Configuring_remote_or_local_nat_traversal.jpg/500px-Configuring_remote_or_local_nat_traversal.jpg" alt=""><figcaption></figcaption></figure>

\
4\. We assume that a [local NAT](https://docs.telcobridges.com/wiki/Create_NAT_Traversal_C) has been created and allocated. SBC/Tmedia can be configured for RTP messages traversing a local NAT as follows:<br>

* No NAT: SBC/Tmedia is not behind a NAT for RTP messages.
* Existing \[Local NAT name] item: local NAT name that will be used for the local RTP traversal method.<br>

Select the appropriate method for RTP NAT Traversal.

<figure><img src="https://docs.telcobridges.com/w/images/thumb/9/9d/Selecting_local_method_for_rtp_nat_traversal.jpg/900px-Selecting_local_method_for_rtp_nat_traversal.jpg" alt=""><figcaption></figcaption></figure>

5\. We assume that a [local NAT](https://docs.telcobridges.com/wiki/Create_NAT_Traversal_C) has been created and allocated. SBC/Tmedia can be configured for SIP messages traversing a local NAT as follows:<br>

* No NAT: SBC/Tmedia is not behind a NAT for SIP messages.
* Existing \[Local NAT name] item: local NAT name that will be used for the local SIP traversal method.<br>

Select the appropriate method for SIP NAT traversal.

<figure><img src="https://docs.telcobridges.com/w/images/thumb/5/59/Selecting_local_method_for_sip_nat_traversal.jpg/900px-Selecting_local_method_for_sip_nat_traversal.jpg" alt=""><figcaption></figcaption></figure>

6\. Click Save.


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