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

Tzafrir Cohen tzafrir.cohen at xorcom.com
Sat Sep 30 12:39:09 MST 2006

On Sat, Sep 30, 2006 at 02:35:49PM -0400, Jay R. Ashworth wrote:
> 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?

Seems to be.

There was a whole thread about this, labled "9.911" from the end of

Tzafrir Cohen         sip:tzafrir at local.xorcom.com
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tzafrir.cohen at xorcom.com     http://www.xorcom.com

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