When setting up a PRI circuit to work with Switchvox using a Digium T1/E1 interface card you may encounter a common issue where incoming calls are successful but outbound calls fail, with Switchvox playingback playing back an error message saying that the call has failed with "Error Code 90". There are two issues which will cause this scenario and they are fairly easy to remedy, and are listed below along with the steps to remedy them.
...