Viking E-35-EWP entry phone rings once then hangs up

I added a Viking E-35-EWP entry phone as a extension to our freePBX system. Using the entry phone, if I call into a VOIP phone number, ring group or just an extension the entry phone rings once then hangs up. The system also has a Grandstream gateway with two “copper” lines. If I dial one of the “copper” lines from the entry phone it works fine, rings till someone picks up. I’m new to this so I’m hoping I just missed something simple.

Figured it out. On the Viking unit itself In-Band Audio Call Progress was disabled. Once Enabled it worked properly.

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