All you need then is a loop start trunk port. Any SIP ATA designed to connect 
to an ANALOG PSTN line.

The doc you sent doesn't show any rj11, so someone probably installed one to 
the first pair out of the 25 pair cable, blue/white

If you were to plug any old phone into that you should at least hear a live 
connection and dial tone from the box

You will need to send dtmf tones to the box for specific zones, or all call. That may be 
one reason you think but don't get an "auto answer" IF you are using an FXO ATA 
then it is sitting there waiting for some DTMF digits 1-9 for the zones, and zero for all 
call

This is also a "talk back" system. Does the customer expect to use the talk 
back feature?

You will need to put that into your dialplan

All easy to do in Asterisk

Similar but quite different than what I have. I announce incoming call numbers 
through the system, as well as quarterly time announcements through call files 
and a cron job. I use an FXO port off a channel bank, but an ATA with an FXO 
port should do the trick


Enjoy

John Novack

Michael Munger wrote:
Excellent point.

This is it: https://www.valcom.com/pdf/v-1109rthf.pdf

Get Outlook for Android <https://aka.ms/ghei36>




On Thu, Mar 21, 2019 at 7:22 PM -0400, "John Novack" <[email protected] 
<mailto:[email protected]>> wrote:



    Michael Munger wrote:

    Does anyone have an (overhead) paging system that they like that works with 
SIP?

    We’ve got a client with an old paging system that (supposedly) just takes 
an rj11 POTS connection, but when we put an SPA Cisco adapter on it, it doesn’t 
auto-answer the call, so paging never happens.


    Does it expect to see a POTS line with battery on it?
    Then a Cisco or other ATA that would work to supply service to a POTS phone 
should work
    OR:
    Does it expect to see a POTS connection from a PBX trunk, and supply 
battery TO the trunk?
    Then you would need a Cisco or other ATA with an FXO connection.

    Both types of paging systems have been made and both styles of connections 
have existed through the last 30 + years, and since you haven't revealed the 
brand and model of paging system it makes troubleshooting difficult.
    Using the existing system can be made to work
    I use a very old Harris PagePak VS that was used with a Western Electric 
Horizon system back in the dark ages with Asterisk

    John Novack

-- Dog is my Co-Pilot




--
Dog is my Co-Pilot

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