[asterisk-users] Dial-9 (was Extension Numbering)

[Naija Man]

>
> ---------- Forwarded message ----------
> From: "Jay R. Ashworth" < jra at baylink.com>
> To: asterisk-users at lists.digium.com
> Date: Sat, 30 Sep 2006 14:35:49 -0400
> Subject: [asterisk-users] Dial-9 (was Extension Numbering)
> On Sat, Sep 30, 2006 at 01:40:09PM +0100, Gordon Henderson wrote:
> > Here in the UK, I've installed several small systems without a dial-9
> for
> > an outside line type thing. The outside line prefix is effectively digit
>
> > zero. (which is preserved and dialled on the outgoing zap lines)
> >
> > There is an exception for 999, and I still provide the 9 service too for
>
> This reminds me of something that's bothered me for years, and I'm
> curious how people deal with it.  This is semi-US specific; don't say
> you weren't warned (or that I'm Americo-centric :-).
>
> Using 9 as a dialplan prefix for accessing outside dialtone has one
> *major* problem: 911.
>
> You don't *really* want to (and I believe, legally, you can't) require
> people to dial 9-911.  But, this leads you to an alternate problem.
>
> If you define 911 in your internal dialplan as a cut-through to dial the
> local PSAP over a standard local voice line (and here, I'm assuming you
> have some; VoN 911 is a topic I entirely don't want to get into at the
> moment), then eventually you're going to have either a) a touchtone<tm>
> dial that stutters on it's 1 key, or b) a human who does it, and they're
> going to dial 9-1-800-555-1212, and find themselves talking the EMS
> instead of directory assistance... and no one will understand why...
> and the EMS people will be mad at *you*.
>
> I know that this has been a problem for traditional PBXen for years,
> and the only solution I've ever been able to see is "use 8 as your
> outdial prefix"... but no one seems to ever do that, even 20 years on.
>
> Is this really not a problem?
>
> Cheers,
> -- jra
> --
> Jay R. Ashworth                                                jra at baylink.com
> Designer                          Baylink                             RFC
> 2100
> Ashworth & Associates        The Things I Think                        '87
> e24
> St Petersburg FL USA       http://baylink.pitas.com             +1 727 647
> 1274
>
>        "That's women for you; you divorce them, and 10 years later,
>          they stop having sex with you."  -- Jennifer Crusie; _Fast_Women_
>
>
>
>
>
>
> As a habit, I do not force users to dial 9 or any other prefix of any kind
to access external lines. You can just check the dialled number and prefix
with appropriate digits appropriately. See below. NOTE: THIS IS US-CENTRIC!!
but can be easily made to work for any country.


[context for out-bound numbers]
;
;Check for incoming calls…
;
; Domestic e.164 US numbers go out unchanged.
;
exten => _1XXXXXXXXXX,1,Goto(outgoing,${EXTEN},1)
;
;
; Check for 10 digit NANP
exten => _XXXXXXXXXX,1,SetVar(PREFIX=1)
exten => _XXXXXXXXXX,2,Goto(outgoing,${PREFIX}${EXTEN},1)

; Check for 7 digit NANP
;  Then add "1" and the location area code
;
exten => _XXXXXXX,1,SetVar(PREFIX=1925)
exten => _XXXXXXX,2,Goto(outgoing,${PREFIX}${EXTEN},1)

; Check for emergency numbers
;
exten => 911,1,Goto(emergency,911,1)
;
; Check for other special numbers and direct to repective contexts.
;
;
[outgoing]
exten => _X.,1,ChanIsAvail(${PSTNCHANNEL})
exten => _X.,2,NoOp(AvailChannel=${AVAILCHAN})
exten => _X.,3,Set(DialChannel=${CUT(AVAILCHAN,,1)})
exten => _X.,4,Dial(${DialChannel}/${EXTEN},100)
exten => _X.,5,Congestion
exten => _X.,105,Congestion


Hope this helps.
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