Where to find or how to assemble a network speakerphone for the front door?

Question

Arduino

I have several cameras installed at the exit from the apartment that broadcast in avreg on a remote server + there is a bookmark in the browser for a quick view of who is breaking in the door, but it’s not clear what to do with the sound, you need a device that will allow over the network (from a computer / laptop / phone) press a button (preferably in a browser) and get the opportunity to say something to the speaker installed at the entrance or hear what they say in response. That is, you need an analogue of an intercom, but in order not to get up from the workplace and go to the door, optional sound recording. Maybe someone will tell you a ready-made version, otherwise from ideas, just screw the raspberry at the entrance, put Skype on it and set up auto-up to call there and talk if necessary, but so far it seems like a terrible crutch. There is a Raspberry PI, several different arduinos. The budget for the solution is $100.

Answer 1

RPi and linphone. For point-to-point calls, an asterisk is not required.

Answer 2

In theory, if the cameras were ip, then they often have a microphone and a speaker or a speaker output, and no bicycles :)
For example, this camera practically fits into the budget www.hikvision.ru/products/ip/hiwatch/DS-N241

Answer 3

Sergey Petrikov
"remote server" strongly removed? if you connect it to its audio microphone and speaker and bring it to the speech panel, and then, as mentioned above, sip2sip call

Answer 4

Answer 5

What's the problem with flipping 180?