14.4.4. Assignment of the Information Tones 
Select the country-specific SIU tone table for DSN:
CHANGE-ZAND:TYPE=TN,SIUC=V; DSN tone table for a-law CHANGE-ZAND:TYPE=TN,SIUC=W; DSN tone table for u-law ACT-USSU:UNIT=SIU;
In order to receive the US camp-on beeps the following ZAND parameter must be set
CHANGE-ZAND:TYPE=ALLDATA2,CAMPON=YES;
Activate DSN Precedence Call Waiting Tone:
CHANGE-ZANDE:TYPE=MLPP,CWTPRECT=YES;
Activate DSN Conference Disconnect Tone:
CHANGE-ZANDE:TYPE=MLPP,CONFDSCT=YES;
IMPORTANT:
DSN call waiting tone for routine calls is 750ms single burst, only once.
DSN call waiting tone for precedence calls is a 100ms double burst every 9.7 seconds.