If you set VDN Override for ASAI Messages to ISDN Trunk or all, Communication Manager does not keep the field setting when an ACD agent or a station user answers an incoming call. The Communication Manager call-transfer or station call-conference features transfer or conference the call with another agent or station user.

If Communication Manager routes an incoming Central Office (CO) call to a VDN that has the VDN Override for ASAI Messages field set to ISDN Trunk or all, the field setting has no effect on the called number information for the ASAI messages.

For calls that are routed through VDNs and are answered by Call-pickup button, then VDN override flag does not get applied.