> For the complete documentation index, see [llms.txt](https://prosbcdocs.telcobridges.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://prosbcdocs.telcobridges.com/tmedia-documentation/configuration/web-portal-3-3/hardware/nat/associate-local-nat-to-nap.md).

# SIP Configuration for Local Symmetric NAT Traversal

> **Applies to:** Tmedia 3.0, 3.2, 3.3; SBC 3.1, 3.3

It is assumed, that a [SIP NAP](/tmedia-documentation/configuration/web-portal-3-3/protocol-stack/sip/allocating-a-sip-network-access-point-nap.md) or a [SIP Open NAP](/tmedia-documentation/other-pages/protocol-stacks-sip/allocating-a-sip-open-network-access-point-nap.md) has already been created and is allocated.

### To configure a Local Symmetric NAT Traversal

1. Select **NAPs** in the Navigation Panel:

![NAP NavigationMenu](https://docs.telcobridges.com/w/images/3/38/NAP_NavigationMenu.png)

2. Select an existing SIP NAP in the list:

![EnableSipISipT 1](https://docs.telcobridges.com/w/images/e/e2/EnableSipISipT_1.png)

3. Click **Network Address Translation (NAT)**:

![Configuring remote or local nat traversal](https://docs.telcobridges.com/w/images/f/fa/Configuring_remote_or_local_nat_traversal.jpg)

4. We assume that a [local NAT](/tmedia-documentation/configuration/web-portal-3-3/hardware/nat/create-nat-traversal.md) has been created and allocated. SBC/Tmedia can be configured for RTP messages traversing a local NAT as follows:

* **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.

Select the appropriate method for RTP NAT Traversal.

![selecting local method for rtp nat traversal](https://docs.telcobridges.com/w/images/9/9d/Selecting_local_method_for_rtp_nat_traversal.jpg)

5. We assume that a [local NAT](/tmedia-documentation/configuration/web-portal-3-3/hardware/nat/create-nat-traversal.md) has been created and allocated. SBC/Tmedia can be configured for SIP messages traversing a local NAT as follows:

* **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.

Select the appropriate method for SIP NAT traversal.

![selecting local method for sip nat traversal](https://docs.telcobridges.com/w/images/5/59/Selecting_local_method_for_sip_nat_traversal.jpg)

6. Click **Save**.


---

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