asterisk users - Jan 2004 - establishing before answer "Early B3" libpri

Hi To ALL
        i have made an application for billing a traffic but i have strange 
problem 
with free message from Telco provider because when dial the number and Telco 
reply "The customer have change number..." i dont receive a connect so
i cant
listen nothing... Yes is right from PRI dont receive a "connect"
signal but
how can listen the mex?
Thanks in advance
Dimi

PS: Happy New Year

I have found some info about it in the CAPI function early-B3 is possible use 
this type of function in libpri?