asterisk users - Jun 2006 - Question setting up a "bat phone" extension.

Basically, I am looking to set up an extension which will be used as a
"help-line".
 I want it to function kind of like the bat phone from the old Batman series,
where Commissioner Gordon would pick up the extension in his office and it
would ring the phone back at Wayne's mansion.  Is there a way to duplicate
this functionality with Asterisk?

I just need asterisk to auto-dial an
extension when I go off-hook on another one.  For instance, I have two SIP
phones, Brian and Susan.  When Susan goes off-hook, it should automatically
ring Brian, without any other activity taking place.  If Brian goes off-hook,
it acts like a normal extension.

Any ideas?

Undrhil

Easy to do on the Linksys PAP2, if that helps. The functionality
probably depends on the make and model of the phone... maybe if you gave
those details as well?

James
> -----Original Message-----
> From: asterisk-users-bounces@lists.digium.com [mailto:asterisk-users-
> bounces@lists.digium.com] On Behalf Of undrhil.1528785@bloglines.com
> Sent: Sunday, 11 June 2006 10:42
> To: asterisk-users@lists.digium.com
> Subject: [Asterisk-Users] Question setting up a "bat phone"
extension.
> 
> Basically, I am looking to set up an extension which will be used as a
> "help-line".
>  I want it to function kind of like the bat phone from the old Batman
> series,
> where Commissioner Gordon would pick up the extension in his office
and it
> would ring the phone back at Wayne's mansion.  Is there a way to
duplicate
> this functionality with Asterisk?
> 
> I just need asterisk to auto-dial an
> extension when I go off-hook on another one.  For instance, I have two
SIP
> phones, Brian and Susan.  When Susan goes off-hook, it should
> automatically
> ring Brian, without any other activity taking place.  If Brian goes
off-
> hook,
> it acts like a normal extension.
> 
> Any ideas?
> 
> Undrhil
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It's called "hotline" or Private Line Auto Ringdown (PLAR).

SIP: It's a function of the phone, look for "hotline" in phone
docs
Zap: immediate=yes, runs exten => when phone is picked up
Cisco and others: Look up PLAR

undrhil.1528785@bloglines.com wrote:
> Basically, I am looking to set up an extension which will be used as a
"help-line".
>  I want it to function kind of like the bat phone from the old Batman
series,
> where Commissioner Gordon would pick up the extension in his office and it
> would ring the phone back at Wayne's mansion.  Is there a way to
duplicate
> this functionality with Asterisk?
> 
> I just need asterisk to auto-dial an
> extension when I go off-hook on another one.  For instance, I have two SIP
> phones, Brian and Susan.  When Susan goes off-hook, it should automatically
> ring Brian, without any other activity taking place.  If Brian goes
off-hook,
> it acts like a normal extension.


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> James Harper wrote:
> > Easy to do on the Linksys PAP2, if that helps. The functionality
> > probably depends on the make and model of the phone... maybe if you
gave
> > those details as well?
> >
> > James
> >
> Fantastic, this may solve the problem In the mail I've just posted
> (which hasnt' appeared yet).
> I don't remember seeing this function in a PAP2, is it fairly trivial
to
> set up?
My dialplan in the pap2 is:

(<:0>S0)

Which causes it to dial a '0' to asterisk as soon as I gets picked up.
In my asterisk dialplan it then does a DISA to another context, which
means Asterisk is doing all the dialplan stuff. For what I want in a
dialplan, I could have configured it in the pap2 but I didn't want to
learn it. I think I'm at that age where everything new I learn means
something else gets overwritten :)

My extensions.conf looks like:
[pap2_in]
exten => 0,1,Answer
exten => 0,n,DISA(no-password|internal)
exten => t,1,Congestion()

Ideally I would have liked the pap2 to have done the same as 'immediate'
when talking about fxo, capi, misdn, etc, but I couldn't get it to
automatically dial nothing. A '0' was the best I could do. If anyone
knows how to put it into immediate mode to come into asterisk as an 's'
extension, I'd love to hear about it!
> Will I need a particular firmware version?
Not sure. I'm using 3.1.3(LS), but if I remember correctly I had this
working on a prior firmware too...

Good luck.

James

> On Sun, 2006-06-11 at 20:52 +1000, James Harper wrote:
> > Ideally I would have liked the pap2 to have done the same as
'immediate'
> > when talking about fxo, capi, misdn, etc, but I couldn't get it to
> > automatically dial nothing. A '0' was the best I could do. If
anyone
> > knows how to put it into immediate mode to come into asterisk as an
's'
> > extension, I'd love to hear about it!
> >
> sip targets arent limited to numerics, have you tried to dial an
's'
> instead of '0'?  That is valid in sip, I just dont know if the pap2
> supports it.
Hey... look at that ... it works! Cool :)

So... asterisk can't tell the difference between 's' for 'no
extension
dialled', and when 's' was actually the name of the extension
dialled...
is this the expected behaviour?

More importantly, is this a security risk in any way? I can't think of a
situation where it would be...

Even more importantly, could this change in a future version?

Thanks

James