[asterisk-app-dev] [asterisk-dev] Endpoints vs Extensions

[Chris Bestall]

Matt, Thank you for the detailed response.  I have replied to the correct
mailing list (asterisk-app-dev).

I have read the ARI portion of the wiki many times, though looks like a lot
of new information is up at the URL you posted since I last visited:
https://wiki.asterisk.org/wiki/display/AST/Introduction+to+ARI+and+Channels

I will take what you posted and read the new information and do some
testing.

> What do you mean by prefix? An example of what flowroute is looking for
would help here.

Flowroute supports IP based authentication for outgoing calls, but I also
need to prepend a prefix before any number when sending an outgoing call.
 The old extension looked like this:

 exten => _1NXXXXXXXXX,1,Dial(SIP/123456789*${EXTEN}@flowroute)

Assuming 123456789 is my prefix.

How does this translate to an endpoint?  Do I need to manually prepend the
prefix when POSTing to URL.  Like

POST /channels?endpoint=PJSIP/123456789*5555551212 at flowroute
&app=my_awesome_app


Thanks,
Chris



On Fri, Aug 22, 2014 at 10:30 AM, Matthew Jordan <mjordan at digium.com> wrote:

> On Fri, Aug 22, 2014 at 8:55 AM, Chris Bestall <chris.bestall at gmail.com>
> wrote:
> > I'm sorry if this has been asked before, but I've googled and not found
> much
> > in the way of help.
>
> Just as an FYI, you may want to e-mail these kinds of questions to the
> asterisk-app-dev mailing list.
>
> We've also started doing a major documentation push for ARI on the
> Asterisk wiki [1] - hopefully we'll get more of these kinds of
> questions answered via those pages.
>
> > I'm using Asterisk 12 and the new PJSIP driver.  I'm also trying to use
> ARI
> > to originate a call.
> >
> > What I'm confused by is the difference between an endpoint and an
> extension.
> > When I use the ARI to originate a call I am required to pass in an
> endpoint.
> > Do extensions even matter on outgoing calls when using PJSIP?
>
> There's a number of terminology definitions that are colliding here.
> From the perspective of ARI and the dialplan, the PJSIP channel driver
> doesn't really have anything to do with this. So the following is more
> of an answer to "What is an endpoint when creating a channel through
> ARI".
>
> An extension is a dialplan concept. It is generally a specific
> location in a context, where its full addressable address is a tuple
> of context, extension, priority.
>
> When you are using ARI, you have channels that have been handed to you
> from the dialplan. You exist as an application within the dialplan -
> since the Stasis dialplan application handed you the channels - but
> you aren't constrained by the dialplan. You can do whatever you want
> with those channels, and don't have to do so within the constraints of
> dialplan execution.
>
> So, an endpoint - from the perspective of ARI - is some identifier
> that a channel driver will understand as the thing that can have a
> path of communication between itself and Asterisk. That could be a
> chan_sip peer, it could be a chan_pjsip endpoint. It could even be a
> location in the dialplan, i.e., extension, via a Local channel. So
> when the POST /channels documentation [2] says:
>
> "endpoint: string - (required) Endpoint to call."
>
> that means it wants your dial string.
>
> You could create a channel directly to a chan_sip peer:
>
> POST /channels?endpoint=SIP/alice&app=my_awesome_app
>
> Or to a chan_pjsip endpoint:
>
> POST /channels?endpoint=PJSIP/alice&app=my_awesome_app
>
> Or, like I said, you could create a path between your ARI app and
> something else in the dialplan. In this case, the "endpoint" is the
> location in the dialplan you're creating a channel to:
>
> POST /channels?endpoint=Local/1000 at default&app=my_awesome_app
>
> Or you could go really nutty and decide your app doesn't event want
> the channel! Instead, you can just spawn channels out into the
> dialplan and ignore them from there on:
>
> POST /channels?endpoint=PJSIP/trunk/sip:alice at my_provider.net
> &context=default&extension=1000&priority=1
>
> Note that in this case, my "endpoint" from ARI's perspective is
> PJSIP/trunk/sip:alice at my_provider.net, which is dialling a SIP URI
> through the PJSIP endpoint "trunk". What an endpoint is depends on the
> frame of reference.
>
> I answered a similar question a few days ago here:
>
> http://lists.digium.com/pipermail/asterisk-dev/2014-August/069880.html
>
> > I have a follow up question as well.
> >
> > I'm trying to use flowroute to perform outgoing calls.  I need to
> include a
> > prefix when calling.  Can this done be done with endpoints via config or
> do
> > I have to include the prefix each time I enter the endpoint?
>
> What do you mean by prefix? An example of what flowroute is looking
> for would help here.
>
> [1] https://wiki.asterisk.org/wiki/pages/viewpage.action?pageId=29395573
> [2]
> https://wiki.asterisk.org/wiki/display/AST/Asterisk+12+Channels+REST+API#Asterisk12ChannelsRESTAPI-originate
>
> Matt
>
> --
> Matthew Jordan
> Digium, Inc. | Engineering Manager
> 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
> Check us out at: http://digium.com & http://asterisk.org
>
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