Very few prisons/jails allow inmates any use of computers at all
> because the authorities assume the prisoners will use them for
> no good. Why, who knows, they may even use web sites to try and
> drum up sympathy for their cause.
>formatting link
> [TELECOM Digest Editor's Note: I would like to know one thing about
> prison phone systems, which are notoriously rip-off systems. The
> prison authorities _claim_ the recipients of phone calls from
> prisoners are not allowed to use _call transfer_ or _call forwarding_
> or _three way calling_ on calls from prisoners. I guess that is
> because the end result -- the person with whom the prisoner wound
> up conversing with -- would possibly not be on the 'approved' list
> at the prison. Does the prison phone system have the technical
> capability to restrict the called party's phone in that way? For
> example, I forward my phone somewhere, then you, in prison, call me
> as we agreed on. Or, you call me from the prison, I flash the
> hook and bring someone else on the line with me. The prison says
> in their literature that is impossible. Is it really? PAT]
I don't see how they can prevent a person outside the system from using a two-line phone to conference two calls on two separate analog lines.