How do I create a SIP trunk?

Alex_Sberna — Thu, 27 Feb 2025 18:06:09 GMT

To create a SIP Trunk, select the Trunks menu option under the Elastic SIP Trunking section of the lefthand navigation menu in the Sinch Build Dashboard. This will bring you to the main page where you can create, view, and edit your Elastic SIP Trunks.

Select the Create New SIP Trunk option from the upper right-hand side of the screen to begin configuring your new SIP Trunk.

Configuring your SIP Trunk

After selecting Create New SIP Trunk the SIP Trunk creation screen is displayed. Here you can name the Trunk as well as create the domain name used to send traffic over it.

In the SIP Trunk Name field, give your SIP Trunk a distinctive name to differentiate it from any other trunks.

After naming your SIP Trunk, create the SIP Domain name you will use when sending calls to your Trunk. Whatever you enter will become your base domain name with .pstn.sinch.com appended to it. For example, if your domain was “mycompany” then your fully qualified domain would be mycompany.pstn.sinch.com. Localized domain names are also available to send directly to your POP of choice. If you do not use a localized domain name we will use geo-DNS to route your traffic to the nearest POP automatically.

Once you have completed these steps, press the Continue button, to move on to configure your SIP Endpoint.

Configuring your SIP Endpoint

A SIP Endpoint contains all the information necessary to send calls to your company IP-PBX or SIP Application. It also allows the IP Address of your device so it can send calls over the SIP Trunk.

Select the Add an Endpoint option to continue. You can also select Next if you want to configure your endpoints later.

After you have selected Add SIP Endpoint the Endpoint configuration screen is displayed. Each endpoint will either be statically defined or use SIP registration.

Static (IP Auth) Endpoints

Give your SIP Endpoint a name which will help identify the device it is pointed to. This is often something like “San Diego Office.”

Once done, also enter the IP Address, Port, and Transport protocol for your SIP Endpoint. If you require encryption, set your transport protocol to TLS.

Registered Endpoints

Select Registered from the Add New SIP Endpoint modal. Give the endpoint a name, transport protocol, and priority for inbound call routing. You will then need to select a credential which will be used for determining the username and password when registering. If you have not yet created any credentials, then you can select Manage Credentials and create one now. If you require encryption, set your transport protocol to TLS.

Finishing Your Endpoints

Priority can be left at the default of “1.” The Priority is used to control inbound traffic if you create multiple SIP Devices. The lowest priority Endpoint will receive all inbound SIP Traffic, with the other SIP Endpoints only receiving calls if there is a failure to the primary. SIP Endpoints may also be configured to the same priority. This will cause the system to round-robin calls between them.

Once you are finished select the Create button to finish setting up your SIP Trunk.

If you are satisfied with the settings, select Next and if you wish to edit the endpoint you can select the hyperlinked endpoint name.

Next steps

After configuring your SIP Endpoints, you must configure your outbound call settings.