Section 10.50. Special Ring Tone depending on Caller

10.50. Special Ring Tone depending on Caller

For certain types of call, a special ring can be signalled at the called terminal (triple cadence). This is possible for internal calls and consultation calls within the same node.

The calling party must be assigned either an off-hook recall classmark in the COS
```
CHA-COSSU:TYPE=COS,COS=number,AVCE=OFHKRC; 
```
or an off-hook recall attribute in SDAT
```
CHA-SDAT: STNO=number,TYPE=ATTRIBUTE,AATTR=OFHKRC;
```
The calling party must also not have any HOTIDX assigned. Check as follows:
```
DIS-SDAT:STNO=number,TYPE=SUBDATA; 
```
The special ring type is set with the AMO ZAND.
```
CHA-ZAND:TYPE=RNGTYPE,PRI=TRPR; 
```
Instead of TRPR, a different special ring may be assigned (see parameter values for PRI in AMO description of AMO ZAND).

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