asterisk users - Dec 2020 - Asterisk registrations - state?

On Tue, Dec 8, 2020 at 1:07 PM Antony Stone <
Antony.Stone at asterisk.open.source.it> wrote:
> Hi.
>
> I'm using Asterisk 16.2.1 with some registrations (ie: my Asterisk
server
> is
> registering to other PBXs as though it were a telephone).
>
> Is there any way I can get presence / state information from those PBXs in
> the
> same way that a registered telephone can?
>
> In other words, can I send a Subscribe request to the PBX so that I get
> Notify
> announcements about other extensions and whether they're idle / busy /
> ringing
> / etc., the same as BLF indicators on a SIP phone can do?
>
> I've looked at
> https://wiki.asterisk.org/wiki/display/AST/Querying+and+Manipulating+State
> but
> this appears to be only for the state of clients registered to my Asterisk
> instance, not for the state of clients registered to the same remote PBX
> as
> Asterisk itself is registering to.
>
There is no functionality present to have Asterisk SUBSCRIBE to upstream
servers, receive updates, and locally use them.

-- 
Joshua C. Colp
Asterisk Technical Lead
Sangoma Technologies
Check us out at www.sangoma.com and www.asterisk.org
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On Monday 14 December 2020 at 13:31:54, Joshua C. Colp wrote:
> On Tue, Dec 8, 2020 at 1:07 PM Antony Stone wrote:
> > 
> > I'm using Asterisk 16.2.1 with some registrations (ie: my Asterisk
server
> > is registering to other PBXs as though it were a telephone).
> > 
> > Is there any way I can get presence / state information from those
PBXs
> > in the same way that a registered telephone can?
> There is no functionality present to have Asterisk SUBSCRIBE to upstream
> servers, receive updates, and locally use them.
Hm, thanks for the clarification, this confirms what I suspected.

Can anyone suggest an alternative application I could sensibly use alongside 
Asterisk in a production environment to achieve this (I'm specifically
looking
for a way to maintain presence information for a Busy Lamp Field, and to get 
notifications about Voicemail events).

I'm aware of both SIPp https://github.com/SIPp/sipp and SipSak 
https://github.com/nils-ohlmeier/sipsak, however these are (to me at least) 
testing scenario tools designed for "short term" use to place and
receive
calls, rather than maintaining long-term subscriptions to SIP accounts, 
waiting for notifications of events, so I'm somewhat wary about considering 
them for use in a production environment (by which I mean I'm looking for 
something which can subscribe to a few tens of SIP accounts (across several 
servers) and get the event notifications for those accounts, over a period of 
days and weeks, and pass them to my display application in almost any 
reasonable form).


Any ideas out there?


Thanks,


Antony.

-- 
I conclude that there are two ways of constructing a software design: One way 
is to make it so simple that there are _obviously_ no deficiencies, and the 
other way is to make it so complicated that there are no _obvious_ 
deficiencies.

 - C A R Hoare

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