10.2.16.3.3. Access Point with individual CP Tone <-> SIU Function Assignment 
When setting system-wide tones (via AMO ZAND), the standard assignment
of CP tones to SIU functions is also set for the system. This assignment
can be adapted system-wide via AMO ZAND (TYPE=TONES, parameter
CPCALL and SIU).
When setting access point-specific tones (via AMO UCSU), the standard
assignment of CP tones to SIU functions for the corresponding access
point is also set. This assignment can be adapted via AMO UCSU (parameter
CPCALL and SIU) to as specific access point.
Example: assign the CP tone "Not possible" to the SIU function 0:
CHANGE-UCSU:UNIT=AP,LTG=1,LTU=17,CPCALL=NOPO,SIU=0;