How to change tone frequency and cadence?

Hi,
When i change value tone frequency in the file indications.conf, Ex
in the file zaptel.conf, i set loadzone=br and default=br
and in the file indications.conf, i change:
[br]

busy=425/250,0/250 ==> busy=428/500,0/500

I have no effect.
Although i change in file zonedata.c, and make install again but have no effect.

How to change frequency to corresponding with my country.
Please help me
Than’k!