Yeah, this feature has various names, like "hot line" and "auto off-hook dial", etc. As a previous post aptly put it, if it has a dialplan then it probably can do a hotline. FTR I found this quickie blurb about the PAP2T which I'm assuming will work with any Cisco/Sipura ATA FXS ports:

http://www.dslreports.com/forum/remark,16471300

Have fun and be sure to wikify this if you get it working in production.
-MC

On Tue, Sep 4, 2012 at 1:17 PM, Gabriel Gunderson <gabe@gundy.org> wrote:
On Tue, Sep 4, 2012 at 1:54 PM, Sean Devoy <sdevoy@bizfocused.com> wrote:
> One of my customers has asked if we can setup a phone on an ATA (or
> otherwise if necessary) that you just pick up and it is automatically
> connected to some number?  Much like the “Bat-phone” or the US to USSR
> Emergency Phone in the Situation room out the White House.

Without looking into this, I'd say you're looking at a feature on the
SIP phone. The servers don't know if the line was picked up or not.
So, you need hardware or software that says, "Now that the phone was
taken off the hook, call this number." Once you have that, you can
solve the rest of the problem in your dialplan.


Gabe

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