Looking for telephone interface breakout board
GordonMcComb
Posts: 3,366
I am looking to develop a microcontroller-based project for a magazine article that centers around interfacing with a standard line telephone, specifically something that:
1. Detects rings
2. Reads the full Caller ID info (name and number)
3. Can answer the phone (and of course hang up)
4. Can connect a basic DC circuit to the line, for things like playing WAV recorded messages
I realize it's possible to build circuits that do these things, but for the level of the readership involved, it's necessary to use a ready-made breakout board. So far I haven't found one, which I find surprising. Like no one wants to create a big Caller ID display screen with their Propeller and VGA display? Come on! Think of the possibilities!!
Anywho, if anyone knows of something READY MADE please let me know. For this article, reading DTMF tones is not a requirement, though that might come in a followup. I won't be covering initiating calls, using text messaging, cellular networks, etc. It's all for old-fashioned POTS.
-- Gordon
1. Detects rings
2. Reads the full Caller ID info (name and number)
3. Can answer the phone (and of course hang up)
4. Can connect a basic DC circuit to the line, for things like playing WAV recorded messages
I realize it's possible to build circuits that do these things, but for the level of the readership involved, it's necessary to use a ready-made breakout board. So far I haven't found one, which I find surprising. Like no one wants to create a big Caller ID display screen with their Propeller and VGA display? Come on! Think of the possibilities!!
Anywho, if anyone knows of something READY MADE please let me know. For this article, reading DTMF tones is not a requirement, though that might come in a followup. I won't be covering initiating calls, using text messaging, cellular networks, etc. It's all for old-fashioned POTS.
-- Gordon
Comments
I don't think that it is that no one wants to. I suspect that the interface just has been subject to so much regulation law that nobody want's to risk a fight with the powers that be.
There at least needs to be an isolation transformer (600 ohm to 600 ohm) and some lightning protection. But there are other aspects that are legal requirements. If you effect the line voltages, the phone company is allowed to disconnect service.
-Phil
http://www.mouser.com/ProductDetail/Silicon-Labs/Si3056-D-FS/?qs=sGAEpiMZZMtROZa%252b%252bXW0ae3DnTjxMvsd
Ken Gracey