VTX1000: Unable to complete a call when connected through an Omni Secure Terminal
The L3 Communications device - Omni Secure Terminal is an encryption unit that utilizes a modem connection.
Because the VTX1000 wideband connection to another VTX1000 also uses a modem the call will not complete.
To resolve this and allow call connection through the Omni device the Wideband Mode on both of the VTX1000's must be disabled.
To Turn Wideband Off on the VTX 1000: