Hi
As per Luigimex the dial tone caluculation is corect I think, but it is for particular model. If it is for public switch, now a days every connected subs will get a dail tone which is virtual dial tone. They will get the congesstion if any so. All these things come under the Time slots[TS] technology. So Matt pls let me know what is your conmfiguration for the TS in your system and also what is the max. subs you are going to support through your switch. I will try to caluculate in gerneral based on your fed back…
bye
Manu.K.