Notification of off hook / not connected status
n4mwd:
Does anyone know of a way to get the Obi200 to send some kind of email or IOT notification whenever the phone is accidentally left off the hook? That is, when the SIP is not actually connected, but the phone is still off hook for more than 1 minute.
azrobert:
The OBi200 has the ability to make a call when nothing is dialed after the phone is taken off-hook. You can get a free account at Callcentric. They have an email notification for voicemail. The email/voicemail you will receive will be silence. You would have to test this to make sure it works. You have to use OBi Expert to configure the OBi200.
n4mwd:
Thanks, I am looking for something that I can use with an IOT device to sound an alarm that would announce that the phone is off the hook over a loudspeaker. What you describe sounds close, but in my case, I would mainly need to detect someone not hanging the phone up after a call is terminated.
It sounds like you are referring to the hotline feature of the OBI which will autodial a number when the phone is picked up or nothing dialed in a certain period of time. Would that also work if someone didn't hang up within a reasonable period of time?
Without the OBI, I can use a circuit to determine if the phone is off the hook, but its not so easy to determine if a SIP connection is still active.
azrobert:
I tested the hotline after a call is terminated and it works. The "S" parameter on the hotline has a max of a 9 second delay, so you have to string them together for a longer delay, e.g., <S9S9:5>. I don't know how many you can string. Dial Tone has a 20 second timeout, so that will have to be changed for a longer delay.
You can route the call to a SIP softphone installed on a computer and hear ringing.
n4mwd:
So what exactly did you put in which dial string to accomplish this? Also, can it repeat dial if the phone continues to remain off the hook with no connection? In order to be an effective approach, it needs to continue until the phone is put back on the hook.
I have also been looking at the phone line polarity. Under "Physical Interfaces" -> "Phone1 Port" -> "Tip-Ring Voltage Polarity" there is a section that might make it possible to detect the status of a call by the polarity of the Tip/Ring wires.
In my case, it would be easier if I could get your approach to work because I would only need a single circuit, say an ESP wifi board to emulate a SIP server, plus the amplifier. This is because the PA system is in a central location that does not have access to a phone line. So if I use the polarity method, I have to have two units, one to detect the off-hook condition and another to activate the PA system - connected by a wireless link.
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