privacy.tex

asterisk 是一个很有知名度开源软件

\end{verbatim}
\end{astlisting}

The 't' allows the dialed party to transfer the call using '\#'. It's
optional.

The 'm' is for music on hold. I suggest it. Otherwise, the calling
party gets to hear all the ringing, and lack thereof. It is generally
better to use Music On Hold. Lots of folks hang up after the 3rd or
4th ring, and you might lose the call before you can enter an option!

The 'P' option alone will database everything using the extension as a
default 'tree'. To get multiple extensions sharing the same database, use
P(some-shared-key). Also, if the same person has multiple extensions,
use P(unique-id) on all their dial commands.

Use little 'p' for screening. Every incoming call will include a
prompt for the callee's choice.

the A(beep), will generate a 'beep' that the callee will hear if they
choose to talk to the caller. It's kind of a prompt to let the callee
know that he has to say 'hi'. It's not required, but I find it
helpful.

When there is no CallerID, P and p options will always record an intro
for the incoming caller. This intro will be stored temporarily in the
\path{/var/lib/asterisk/sounds/priv-callerintros} dir, under the name
NOCALLERID\_$<$extension$>$ $<$channelname$>$ and will be erased after the
callee decides what to do with the call.

Of course, NOCALLERID is not stored in the database. All those with no
CALLERID will be considered "Unknown".

\subsection{The 'N' and 'n' options}

Two other options exist, that act as modifiers to the privacy options
'P' and 'p'. They are 'N' and 'n'. You can enter them as dialing
options, but they only affect things if P or p are also in the
options.

'N' says, "Only screen the call if no CallerID is present". So, if a
callerID were supplied, it will come straight thru to your extension.

'n' says, "Don't save any introductions". Folks will be asked to
supply an introduction ("At the tone, say your name") every time they
call. Their introductions will be removed after the callee makes a
choice on how to handle the call. Whether the P option or the p option
is used, the incoming caller will have to supply their intro every
time they call.


\subsection{Recorded Introductions}

\subsubsection{Philosophical Side Note}
The 'P' option stores the CALLERID in the database, along with the
callee's choice of actions, as a convenience to the CALLEE, whereas
introductions are stored and re-used for the convenience of the CALLER.

\subsubsection{Introductions}
Unless instructed to not save introductions (see the 'n' option above),
the screening modes will save the recordings of the caller's names in
the directory \path{/var/lib/asterisk/sounds/priv-callerintros}, if they have
a CallerID.  Just the 10-digit callerid numbers are used as filenames,
with a ".gsm" at the end.

Having these recordings around can be very useful, however...

First of all, if a callerid is supplied, and a recorded intro for that
number is already present, the caller is spared the inconvenience of
having to supply their name, which shortens their call a bit.

Next of all, these intros can be used in voicemail, played over
loudspeakers, and perhaps other nifty things. For instance:

\begin{astlisting}
\begin{verbatim}
exten => s,6,Set(PATH=/var/lib/asterisk/sounds/priv-callerintros)
exten => s,7,System(/usr/bin/play ${PATH}/${CALLERID(num)}.gsm&,0)
\end{verbatim}
\end{astlisting}

When a call comes in at the house, the above priority gets executed,
and the callers intro is played over the phone systems speakers. This
gives us a hint who is calling.

(Note: the ,0 option at the end of the System command above, is a
local mod I made to the System command. It forces a 0 result code to
be returned, whether the play command successfully completed or
not. Therefore, I don't have to ensure that the file exists or
not. While I've turned this mod into the developers, it hasn't been
incorporated yet. You might want to write an AGI or shell script to
handle it a little more intelligently)

And one other thing. You can easily supply your callers with an option
to listen to, and re-record their introductions. Here's what I did in
the home system's extensions.conf. (assume that a
Goto(home-introduction,s,1) exists somewhere in your main menu as an
option):

\begin{astlisting}
\begin{verbatim}
[home-introduction]
exten => s,1,Background(intro-options) ;; Script:
     ;; To hear your Introduction, dial 1.
     ;;    to record a new introduction, dial 2.
     ;;    to return to the main menu, dial 3.
     ;;    to hear what this is all about, dial 4.
exten => 1,1,Playback,priv-callerintros/${CALLERID(num)}
exten => 1,2,Goto(s,1)
exten => 2,1,Goto(home-introduction-record,s,1)
exten => 3,1,Goto(homeline,s,7)
exten => 4,1,Playback(intro-intro)
     ;; Script:
     ;; This may seem a little strange, but it really is a neat
     ;; thing, both for you and for us. I've taped a short introduction
     ;; for many of the folks who normally call us. Using the Caller ID
     ;; from each incoming call, the system plays the introduction
     ;; for that phone number over a speaker, just as the call comes in.
     ;; This helps the folks
     ;; here in the house more quickly determine who is calling.
     ;; and gets the right ones to gravitate to the phone.
     ;; You can listen to, and record a new intro for your phone number
     ;; using this menu.
exten => 4,2,Goto(s,1)
exten => t,1,Goto(s,1)
exten => i,1,Background(invalid)
exten => i,2,Goto(s,1)
exten => o,1,Goto(s,1)

[home-introduction-record]
exten => s,1,Background(intro-record-choices)    ;; Script:
     ;; If you want some advice about recording your
     ;; introduction, dial 1.
     ;; otherwise, dial 2, and introduce yourself after
     ;; the beep.
exten => 1,1,Playback(intro-record)
     ;; Your introduction should be short and sweet and crisp.
     ;; Your introduction will be limited to 4 seconds.
     ;; This is NOT meant to be a voice mail message, so
     ;; please, don't say anything about why you are calling.
     ;; After we are done making the recording, your introduction
     ;; will be saved for playback.
     ;; If you are the only person that would call from this number,
     ;; please state your name.  Otherwise, state your business
     ;; or residence name instead. For instance, if you are
     ;; friend of the family, say, Olie McPherson, and both
     ;; you and your kids might call here a lot, you might
     ;; say: "This is the distinguished Olie McPherson Residence!"
     ;; If you are the only person calling, you might say this:
     ;; "This is the illustrious Kermit McFrog! Pick up the Phone, someone!!"
     ;; If you are calling from a business, you might pronounce a more sedate introduction,like,
     ;; "Fritz from McDonalds calling.", or perhaps the more original introduction:
     ;; "John, from the Park County Morgue. You stab 'em, we slab 'em!".
     ;; Just one caution: the kids will hear what you record every time
     ;; you call. So watch your language!
     ;; I will begin recording after the tone.
     ;; When you are done, hit the # key. Gather your thoughts and get
     ;; ready. Remember, the # key will end the recording, and play back
     ;; your intro. Good Luck, and Thank you!"
exten => 1,2,Goto(2,1)
exten => 2,1,Background(intro-start)
     ;;  OK, here we go! After the beep, please give your introduction.
exten => 2,2,Background(beep)
exten => 2,3,Record(priv-callerintros/${CALLERID(num)}:gsm,4)
exten => 2,4,Background(priv-callerintros/${CALLERID(num)})
exten => 2,5,Goto(home-introduction,s,1)
exten => t,1,Goto(s,1)
exten => i,1,Background(invalid)
exten => i,2,Goto(s,1)
exten => o,1,Goto(s,1)
\end{verbatim}
\end{astlisting}

In the above, you'd most likely reword the messages to your liking,
and maybe do more advanced things with the 'error' conditions (i,o,t priorities),
but I hope it conveys the idea.