> 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/telecom-references/sip-and-voip/configuring-sip-registration-for-open-nap.md).

# Configuring SIP Registration for Open NAP

> **Applies to:** SBC 3.0

An Open NAP is a NAP that faces the internet and covers all IP end points that can access the ProSBC. Registration from outside the internet via Open NAP will be passed through ProSBC to the SIP Registrar.

You must configure SIP Registration Domain(s) for your Open NAP and associate them to the Open NAP. Configuring SIP Registration for Open NAP in ProSBC requires no extra steps.

To create a new NAP:

1- Click **NAPs** in the navigation panel

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

2- Click **Create New NAP**

![Create New NAP SIP](https://docs.telcobridges.com/w/images/2/26/Create_New_NAP_SIP.png)

3- Create the new NAP:

* Enter a **name** for the NAP
* Click **Create**

![Open NAP Create](https://docs.telcobridges.com/w/images/9/9a/Open_NAP_Create.png)

4- Verify that the **NAP was successfully created** message appears

![Create New NAP SIP2](https://docs.telcobridges.com/w/images/f/f0/Create_New_NAP_SIP2.png)

5- Associate a SIP transport server with the new NAP:

* Select a **SIP Transport Server** from the **Available** list
* Click **"<<"** to associate the **WAN\_SIP\_TS** with the NAP

![Open NAP Create 1](https://docs.telcobridges.com/w/images/a/ac/Open_NAP_Create_1.png)

6- Disable proxy address:

![Open NAP Create NoProxy](https://docs.telcobridges.com/w/images/0/0e/Open_NAP_Create_NoProxy.png)

7- Enter full access in the access control list

* Enter an **IP/MASK** (use 0.0.0.0/0 to accept any addresses)
* Click **"<<"** to add in the list of Access Control

![Open NAP Create ACL](https://docs.telcobridges.com/w/images/4/4c/Open_NAP_Create_ACL.png)

8- Associate a Port range with the new NAP:

* Select a **port range** from the **Available** list
* Click **"<<"** to associate **WAN\_Vlan:0** Port range with the NAP

![Open NAP Create 2](https://docs.telcobridges.com/w/images/8/80/Open_NAP_Create_2.png)

9- Associate a SIP Domain with the new NAP. If you have more than 1 domain you need to associate all of them with OPEN NAP/SIP NAP:

* Select a **sip domain** from the **Available** list
* Click **"<<"** to associate the SIP Domain with the NAP

![Open NAP Create 3](https://docs.telcobridges.com/w/images/8/81/Open_NAP_Create_3.png)

10- Configure settings for the following parameter groups as required:

* Check **Accept only authorized users** option. With this option unchecked, FreeSBC will forward any INVITEs sent to the "Open NAP" to the PBX without first authenticating the user.
* Registration Parameters
* Authentication Parameters
* Network Address Translation
* SIP-I Parameters
* Advanced Parameters
* Click **Save**

![Open NAP Create 4 2](https://docs.telcobridges.com/w/images/d/d6/Open_NAP_Create_4_2.png)


---

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