13.3.4.11. Announcement for call to AC in night service 
The same principles as for AC in day service apply. If, during night
service, the same announcement is injected as during day service, the
following must be checked in case the TMOM and the CAC are located in
different nodes:
- Is this a homogeneous OpenScape 4000/HiPath 4000 network?
It could possibly happen that the information stating that the CAC in the destination node is in night service may not transmitted in mixed networks.
- Is there a multiple-embedded CAC function in the destination node?
In this case the possible night service of the CAC in the destination node is not recognized and therefore is not transmitted to the originating node.
- Was the CAC switched from day to night service after seizure?
In this case, only the announcement for day service can be injected. The implemented concept does not provide an update of the day/night status of the CAC in the destination node.
- Have the correct entries been made in the announcement reason/announcement type table, ANNMITR (WANNDNS, SYNCA)?
- Is the announcement reason (WANNDNS) entered in the ANNTONE branch in the AMO-SYNCA?
- Are you sure that the COT parameter ABNA has NOT been set for the connecting line?