asterisk users - Dec 2003 - s, h, t, etc, extensions?

I'm in the process of reworking my dialplan to include an ivr and
other items. I've seen several examples over the last several months
that mention the "s", "h", "t" (and probably
others) extensions, but
I don't fully understand what they are used for. Can someone either
give a short definition of each or point me towards some doc?

> I'm in the process of reworking my dialplan to include an ivr and
> other items. I've seen several examples over the last several months
> that mention the "s", "h", "t" (and probably
others) extensions, but
> I don't fully understand what they are used for. Can someone either
> give a short definition of each or point me towards some doc?
s = start
h = hangup
t = timeout

start is where the dialplan starts when no extension is given.  hangup and 
timeout are pretty self-explanatory; they are where the dialplan jumps to 
on hangup or timeout, respectively.

Regards,
Andrew

On Sat, 2003-12-20 at 16:57, Rich Adamson wrote:
> I'm in the process of reworking my dialplan to include an ivr and
> other items. I've seen several examples over the last several months
> that mention the "s", "h", "t" (and probably
others) extensions, but
> I don't fully understand what they are used for. Can someone either
> give a short definition of each or point me towards some doc?
s = Start. Used primarily for dialplans that enter a context with no
other extension information. Think of a non DID phone line, call comes
in, and we may only know that the line is ringing and nothing else. Even
if you knew callerid, you have to still have a place to start. You can
also think about s as a place to place part of the dialplan that you
don't want callers to get back to unless they have passed through other
functions.

t = Timeout. Used for when calls have been inactive after a prompt was
played. Also used to hang up a line that has been idle.

h = Hangup. Used to clean up a call. Could be used to play a goodbye
message before hanging up. Also seemingly used by the calling card
people to record end of call for billing purposes.

-- 
Steven Critchfield <critch@basesys.com>