I recently upgraded my client’s Avaya IP Office from R10.1.3 to R11. The client has utilized the Mobile Twinning feature with no issue since they were on R9 with no issues. Unfortunately, since the upgrade to R11, the client is experiencing an issue whereby twinned calls that are answered on their cell phone first will no longer release whether the call is disconnected by the client first or disconnected by the outside caller. The very next call to the client’s same DID phone number goes directly to the voice mailbox associated with their Avaya 1416 digital desk phone. System status shows that the mobile twinned call is still active even though both the outside calling party and the client have both hung up the call. The Avaya System will not release that call. I must manually disconnect the call via System Status. Has anyone else in the Tek-tips forum experienced this issue? Please advise.