Call flow.
Toll Free number from AT&T routes to hird Party Call center and IVR vendor.
Their call flow determines needs to route to our on-site Call Center (via skill number configured ) ATT ISDN trunks Avaya CM version 6.3.0.124.0-21460.
They perform an InBand Transfer and Contact via AT&T passing the UUI ( UUI is send by 3rd party application vendor ) This routes to another AT&T toll free number which terminates to our Trunk group 63 ISDN passing DNIS with the UUI information incoming calls arrives to CM and call is received by Avaya OneXagents Fw 2.5.5
Here OneXagent not present incoming UUI send by 3rd party application via ATT ISDN trunk.