> 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/configuration-details/configuration-by-use-case/sip-registration-forwarding/configuring-sip-registration-for-open-nap.md).

# Configuring SIP Registration for Open NAP

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

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

\
2- Click Create New NAP

<figure><img src="https://docs.telcobridges.com/w/images/2/26/Create_New_NAP_SIP.png" alt=""><figcaption></figcaption></figure>

\
3- Create the new NAP:

* Enter a name for the NAP
* Click Create

<figure><img src="https://docs.telcobridges.com/w/images/9/9a/Open_NAP_Create.png" alt=""><figcaption></figcaption></figure>

4- Verify that the NAP was successfully created message appears

<figure><img src="https://docs.telcobridges.com/w/images/f/f0/Create_New_NAP_SIP2.png" alt=""><figcaption></figcaption></figure>

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

<figure><img src="https://docs.telcobridges.com/w/images/a/ac/Open_NAP_Create_1.png" alt=""><figcaption></figcaption></figure>

6- Disable proxy address:

<figure><img src="https://docs.telcobridges.com/w/images/0/0e/Open_NAP_Create_NoProxy.png" alt=""><figcaption></figcaption></figure>

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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

<figure><img src="https://docs.telcobridges.com/w/images/4/4c/Open_NAP_Create_ACL.png" alt=""><figcaption></figcaption></figure>

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

<figure><img src="https://docs.telcobridges.com/w/images/8/80/Open_NAP_Create_2.png" alt=""><figcaption></figcaption></figure>

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

<figure><img src="https://docs.telcobridges.com/w/images/8/81/Open_NAP_Create_3.png" alt=""><figcaption></figcaption></figure>

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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

<figure><img src="https://docs.telcobridges.com/w/images/d/d6/Open_NAP_Create_4_2.png" alt=""><figcaption></figcaption></figure>


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