I have a vintage rotary phone I am trying to hook up to my Sonic VOIP. I have a pulse dial to tone converter to hopefully allow me to dial out, but am having issues with the ringer. Using my Voltmeter, I can see I am getting 48V at 20Hz from the wall jack when the phone rings, not the 90V at 20Hz as required for an old phone such as this. The phone therefore does not have enough voltage to strike the bells. Just wondering if there's a way to boost the ring voltage either locally, or through settings Sonic customer service might have access to.
48 volts? WHAT? I've never seen a phone ring on 48 volts. I spent over 25 years at AT&T, and it was always 85 to 105 volts AC (20Hz).
48 volts DC was the standby voltage normally available on an idle line.
That was then, before VOIP. All signaling and power came from the Central Office on that copper wire pair. A VOIP device (i.e. the Sonic modem sitting on your desk) only gets a very small signal through the internet, then depends on local power (from your AC outlet) and conversion circuitry inside the modem, to create ring voltage and talk voltage.
You might research the requirements for ring voltage in the VOIP industry... hope that helps. An