If an external system or carrier is unable to send the called party number as a subscriber, national or international station number, then the corresponding trunk must be assigned to a virtual node with the AMO TDCSU parameter VNNO. The stations in this node will then be reached by this trunk with the station number. Stations in other virtual nodes can be reached by this trunk by dialing the node code + station.

ADD-TDCSU:OPT=NEW,PEN=1-1-1-1,COTNO=20,COPNO=20,DPLN=0,
ITR=0,COS=1,LCOSV=1,LCOSD=1,CCT="S2 CO",DESTNO=99,
PROTVAR=EDSGER,SEGMENT=1,ATNTYP=CO,ISDNIP=00,ISDNNP=0,
TRACOUNT=8,NNO=1-1-199,TGRP=1,SRCHMODE=ASC,INS=Y,DEV=S2COD,
BCHAN=1&&30,BCNEG=Y,BCGR=1,LWPAR=1,VNNO=1-1-95;