How to implement a speakerphone in production and tie it to sip-telephony?

Question

Asterisk

The management of the company constantly has an urgent need to notify everyone at once over the speakerphone, or to find some character who left the phones on the table and went to the hangar workshops.
It should be like this: pick up the phone, dial the extension number, and bark at the whole building, at all hangars (or individually).
Of the existing ones, there is a native asterisk and sip-phones on the tables in the office and in the areas in the workshops.
My thought is this: asterisk -> network -> voip gateway -> something with a speaker, an amplifier, maybe horn-type dates (for workshops).
Can you tell me the options, brand, model?
UPD: I need something that will connect the asterisk and analog power amplifiers + horn speakers.
UPD2: CyberData V3 VoIP Zone Controller seems to be suitable for my tasks

Answer 1

Many models of stationary SIP phones have the ability to force the speakerphone to turn on without lifting the handset.

exten => _000XXX,1,SIPAddHeader(Call-Info:\;answer-after=0)
same => n,Page(SIP/${EXTEN:3},is)

The second option, if the computer with Asterisk has a sound card, then you can raise chan_alsa or chan_oss with auto-response and broadcast through it.

Answer 2

As an option: Raspberry Pi + SIP client + amplifier + speaker

Answer 3

There are external sounds in the form of a USB whistle. They fit pretty well into the system. Articles met - google. The number of whistles (=alert channels) depends on the number of USB ports in the server... Well, nobody canceled USB hubs...
I myself tried the option of using the Addpac-IP150 VoIP phone. It has standard "3.5" jacks - microphone and speakers. The sound quality is disappointing. I did not try to implement it myself through the first option. My task was to fasten an analog VHF radio communication to the asterisk - a HF channel (E&M without control).
PS Why don't you redirect from landline to mobile? If I understand correctly, then the phrase of the head in the speakers of the desired workshop will always be approximately the same - "Petrovich, your copper hedgehog! Urgently call!". That is, it is absolutely not informative and in one direction ... While forwarding to a mobile phone will allow you to make a "targeted infusion" without leaving the cash register!

Answer 4

1) Buy any phone with an auto-answer function of the handset and connect the speakerphone to the amplifier.
2) Take an old computer, install any SIP client with an auto answer function and connect it to the amplifier.
3) Organize a conference room to connect options 1 and 2 () see above.
4) Pervert. make a voice box. Read the contents of the folder by cron, if a sound file is found, play it.