14.4.5. Assignment of Ringing Tones 
Assign DSN ringing for analog subscribers
CHANGE-PTIME:TYPE=SLMA,RNGON0=2000,RNGOFF0=4000, RNGON61=1640,RNGOFF61=360,RNGON62=1640, RNGOFF62=360,RNGON63=1640,RNGOFF63=360;
Assign DSN ringing for digital subscribers
CHANGE-ZAND:TYPE=RNGTYPE,NORM=DSNR; [V2.0 only]
Assign DSN ringing for ulaw switch
CHANGE-ZAND:TYPE=ALLDATA2,USRINGTY=K; CHANGE-ZAND:TYPE=ALLDATA,CNTRYCD=K;
Assign DSN ringing for alaw switch
CHANGE-ZAND:TYPE=ALLDATA2,USRINGTY=0; CHANGE-ZAND:TYPE=ALLDATA,CNTRYCD=0;