I have an ATA with two analog lines out.
I currently have one of the lines plugged into my Sat Box and enjoy the on-screen Caller-ID that means I don't have to scramble to grab a phone if it's an unwanted call.
What I'd like to do is hook up an Automatic Phone-Line Switch, so the Caller ID from both lines can be sent to the SAT box for on screen display.
I don't care what line is present for outbound calls, as the PVR is Ethernet connected and all I care to send to the box is the Caller ID for both lines. :D
Radio Shack made what appears to be the perfect device back in 1997, that was marketed to share an answering machine with two lines.
Obviously, it's no longer available for sale anywhere, but here is the datasheet:
Set your answering system so it is ready to answer calls.
If a call comes in on line 1, the phone-line switch connects the
answering system to line 1. If another call comes in on line 2,
the caller on line 2 will continue to hear ringing until the answer-ing
system finishes taking the message on line 1. Then the
phone-line switch will automatically switch the answering sys-tem over to line 2 so it can answer the second call.
If a call comes in on line 2 and the answering system is not
busy, it will be switched immediately to line 2 to answer the ring-ing
When two lines are ringing at the same time, the line that began ringing
first has priority.
If your answering system has a switch that lets you choose
the number of rings before the system answers, set the
switch to the minimum position.
The phone-line switch is used for selecting
which incoming calls to answer. If you are using the phone-line switch with a telephone, you cannot use it to select the line for outgo-ing calls.
I am mentally thinking of needing to solder a toggling relay that will switch using the ring current of the first ring, but will it be fast enough to have the SAT box "see" the first ring and then capture the Caller ID data, if the relay is on the wrong line. A schematic of a solution would be welcome as well.
I searched the forum, and I think I'm the first to ever contemplate this one.