Communication Manager selects the site for call routing, and sends the call to the public network. The public network switch sets up a second leg of the call and passes the codeset 0 UUI information in the SETUP message, if this is supported. If you set the Net Redir field on the BSR Application screen to y for location 1, location 2, and location 3, Communication Manager sends a request to the public switch for call transfer over the public network.
For incoming 800 number calls from MCI DMS-250 network switches, you must ensure that the vector reached by the second leg call is answered immediately and an ISDN CONNect message is sent. This can be accomplished with a wait 0 secs hearing music or an announcement step as the first step in the receiving interflow vector.