> Hi,
> 
> > It also works with M20.
> > I just did a hack to mgetty that can read Caller ID and 
> pass it to another
> > authorization
> > program/script.
> 
> great! -- what about concurrancy while calling?!
> 
> (see my previous post)
> 
> Is the patch to mgetty available?

I did not make myself clear, this feature already is implemented in mgetty.
I just added one record to the table which contains recognized prefixes for
caller id. I don't have patch. 
How about concurrency ? If the traffic is so big that it is possible that
two users are calling at once, we may be stucked. 
I don't have experience with ISDN. But there is one trick that may help : we
have two GSM modems connected, two mgetty's and one modem is primary. 
We set up primary modem to divert calls when busy to the other, and don't
have rejection ! I hope this is possible. 

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