Simultaneous Use question

[Miguel]

Hi, at what time is the user included in the radutmp file, in the 
authentication process or after a successful connection?
I mean, if i agree with some friend and make at the same time (well, 
almost...., supose 30 seconds delay from one call to another) a 
connection attemp, both will be authenticated by the nas, or there is 
some way to know in advance that an authentication is in progress and 
deny any other for that user?
I've verified im having this problem, i use freeradius + postgres for my 
voip solution, with the wonderful pgsql-voip scripts from Peter, if a 
pin has an active call, nobody can make another call, but in the seconds 
when the ivr is telling the user "please enter your card number 
blablabla....", you are allowed to call the access number and interact 
with the ivr too, and if both users enter the same valid pin,  both 
calls are established.
Am i confusing or missing something???
I can give you more details if you need it.
thanks