QuelleCalling Card Service Prompt Tone
This tone is used to inform the customer that his/her credit card
information must be keyed in. The first 60 milliseconds of this
composite tone is 941 Hz abd 1477 Hz which is the DTMF '#'. This tone
will release and DTMF to dial pulse converter in the conneciton.
Calling Card Service Prompt Tone is 941 Hz and 1477 Hz at -10
dBm0/frequency at -3 Transmission Level Point for 60 milliseconds and
then 440 Hz and 350 Hz at -7 dBm0 for .940 seconds exponentially decayed
from -10 dBm per frequency at -3 Transmission Level Point at time
constant of .2 seconds.