SIP.US on Interactive Intelligence CIC

Configuration of Interactive Intelligence's CIC product for use with SIP.US is very simple, but has some limitations you should be aware of. For CIC products that are not behind NAT, you can use either IP Authentication or Digest-based Authentication to connect your system to SIP.US. If your CIC product is behind NAT, you must use IP Authentication unless you have an SBC. With an SBC you can use Digest-based Authentication behind NAT, but you must translate the private IP address that is sent by the CIC device into your public IP address so that calls are delivered to the correct address by SIP.US

This guide will show you how to connect your CIC device with SIP.US using IP Authentication. If you would like assistance using Digest-based Authentication, please open a support ticket using the support link at the top right of the screen.

1. Login to your SIP.US portal, click "SIP Trunking," and then "Modify Trunk." You must click the "IP Authentication" check-box, and then enter your public IP and the port packets will be received from by SIP.US. After clicking "Save" your trunk is configured to use IP Authentication and we will only accept packets from the address and port combination you have entered.

2. Configure the line as pictured below

3. Set up inbound calling using the "Identity (In)" tab.We find that the settings pictured below provide the best reliability for delivering calls successfully

4. Set the "Identity (Out)" tab to use your SIP.US trunk number as the calling address. The format in the image below is correct for use with our servers.

5. Configure the CIC to use UDP for transport. We do not accept TCP on port 5060. If you would like to set-up the CIC to use TCP, please open a ticket with support using the link at the top-right to receive further instructions.

6. We chose to set-up two proxies rather than use SRV. Both of the proxies listed in the image below are always available to SIP.US users. With the configuration pictured below, the CIC will use unless it is unavailable, then it will automatically use This provides for redundancy as these are geographically and logically redundant proxies. 

7. Apply and save your settings. Make some test calls!

If you experience any issues after using this guide, simply open a support ticket using the link at the top-right of the page.

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