# Configuring Elastic SIP Trunking with Ribbon SBC

Sinch Elastic SIP Trunking can easily integrate with Ribbon SBC. Follow this guide to learn how!

## Before you start

Before you begin setting up your Sinch Elastic SIP trunk make sure you have done the following:

* Sign up for a free account at https://www.sinch.com/ and request access for Elastic SIP Trunking. Need help? Click [here](https://community.sinch.com/t5/Customer-Dashboard/How-to-sign-up-for-your-free-Sinch-account/ta-p/8058) for instructions.
* If you have not already done so, configure and create your Elastic SIP trunk. Instructions on how to do this can be found [here](https://community.sinch.com/t5/Elastic-SIP-Trunking/Getting-started-with-Elastic-SIP-Trunking/ta-p/11380).
* Ensure you note the fully qualified domain name (FQDN) that was created on your SIP Trunk. You will need this while setting up your IP-PBX or SIP Application.


## Configuring your Ribbon SBC

1. Log into your Ribbon SBC UI with administrator privileges and navigate to **IP Signaling Peer Groups**.
2. Create a new peer group for your trunk.
![ip signaling peer group](/assets/ribbonsbc-serverfqdn.90fa572c79ece0dbb4c2d16cbe7013b8d180528bbcddc1304f3dcce6d7a86781.f40ae551.png)
3. Leave the IP address blank and add the Elastic SIP Trunk's fully qualified domain name (FQDN) you created when building your SIP Trunk to the **Server FQDN** field. When finished, click the **Add/Update** button to create the entry.
4. Next, create a new feature control profile for the trunk. Under feature (set 2), ensure that the *Always Use Billing Number For Calling Party Number* and *Always Use Redirecting Number For Calling Number* options are both selected.
![feature control profile](/assets/ribbonsbc-featurecontrol.7faa2b811051dc60a3aff07d136164a1a1f2f387d3aaeb78236523099123378d.f40ae551.png)
Save this profile when finished.
5. If you do not already have one, open the codec entry page and set up a new codec profile for **G.711uLaw**.
![codec profile](/assets/ribbonsbc-codec.7abd3821cc76d7524b6cacd6927348e61a623426bb3011ac2f2a82cd3148624e.f40ae551.png)
Set the **Packet Size** to 20 ms and ensure you enable **ULaw** and **RFC 2833**.
6. Finally, add the new codec entry to the Trunk's packet service profile.
![codec entry](/assets/ribbonsbc-codecentry.f21224a8f98cf82340360f1d8e180aea5d4c5d412628d2c3018c935ef4d99d29.f40ae551.png)
7. Your Elastic SIP trunk should be operational and ready for traffic. Assign a number to your trunk and give it a try!