Hi Martinyesor 1. get rid of the isdn dial ins :-)2. or reserve  fixed poorts for dial in3. or use  the TMS shedulergreetingsthomas

Hi Martin,Smart Scheduler only schedules external SIP clients.  It doesn't do ISDN dial-in or external dial-out.Potentially you could reserve ports for externals to dial-in.  If your ISDN gateway can connect to your MCU it would work.ISDN user calls ...