VOIP ringer requirements

[Babybearjs]

I recentlysalvaged a ringer out of a phone that was made by Conair. the ringer when wired with a .47uf cap did not  ring on my VOIP line so I tried it without the cap and it rang fine. on standard pjones, do you have to bypass the cap in order to get the phone to ring because of VOIP modem that runs the line. I have had to put all my ringers in a Low Bias position in order for the phone to ring, and found that the modems will only support 1 ringer. does anyone know more about this in order to get  more ringers to work on my system. I curremtly am using the Ooma Telo Modems...

[countryman]

A mechanical ringer should seize the line immediately instead of ringing when wired without a capacitor. Have you measured the DC resistance of the said ringer?
It is a known problem that VOIP stuff often suffers from low ringing power.
0.47 µF is quite low for a ringer capacitor, 1 µF might be tried.

[dsk]

I would have said the same as @Countryman. + By my experience the telephone adapters may often have less ring power than the old POTS line, but you may often adjust the output signal.  20 Hz may somtimes be better than 25, even on European ringers.  The higher voltage the stronger signal. Ringers of low DC resistance under 1000 ohms may need less than 1uF, or a resistor in series to not draw tho high current. Higer resistance may like higher capacitor values. If you are abel to let the ATA ring with square vaves, it may be worth to try.

[Babybearjs]

thank you guys. I'll keep that in mind....

[ChrisW6ATV]

One thing not mentioned here is that the Conair phone is/was a low-cost consumer phone, so its ringer is probably an all-in-one electronic device. Babybearjs, if you still have the rest of the Conair phone, see if you can trace/follow the wiring from the line cord input to where the ringer was connected. It may have been direct, as it was when you got it to work.

Also, look on the bottom of the Conair phone. Does it have a "ringer equivalency number"? 1.0 is a normal Bell 500 or similar ringer.

The catch with Ooma is its proprietary IP-to-line devices. You do not have the option to choose better ones.

[ChrisW6ATV]

One thing not mentioned here is that the Conair phone is/was a low-cost consumer phone, so its ringer is probably an all-in-one electronic device. Babybearjs, if you still have the rest of the Conair phone, see if you can trace/follow the wiring from the line cord input to where the ringer was connected. It may have been direct, as it was when you got it to work.

Also, look on the bottom of the Conair phone. Does it have a "ringer equivalency number"? 1.0 is a normal Bell 500 or similar ringer.

The catch with Ooma is its proprietary IP-to-line devices. You do not have the option to choose better ones.

Unfortunate, because it is a great service.

[5415551212]

I recentlysalvaged a ringer out of a phone that was made by Conair. the ringer when wired with a .47uf cap did not  ring on my VOIP line so I tried it without the cap and it rang fine. on standard pjones, do you have to bypass the cap in order to get the phone to ring because of VOIP modem that runs the line. I have had to put all my ringers in a Low Bias position in order for the phone to ring, and found that the modems will only support 1 ringer. does anyone know more about this in order to get  more ringers to work on my system. I curremtly am using the Ooma Telo Modems...

John do you still run a key system at home with a KSU? I am not a expert on key systems but I thought that they generated their own ring voltage and rang phones on a dedicated pair?

[rcourtney]

Another thing to try is to replace the capacitor with a back-t-back pair of zener diodes that are rated just above the idle line voltage.

SO, if when idle (onhook) the voltage measures 12 volts DC.  Select 2 zener diodes that are slightly above that voltage.
 
https://www.digikey.com/en/products/detail/nexperia-usa-inc/NZX13B-133/2119721 

Wire the pair in series with the banded ends facing each other.

[dsk]

Here may you see parts of my ATA setup om Linksys and Grandstream: 
Not needed to put out that high load alway, all my phones has the original setup except for some German ones with less than 1000 ohms ringers.  (I have added serial capacitors on those to reduce the REN load.)