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Well remember, I connected straight to the analog board of a PBX at my previous job as a test, and it was the same issue, those things are wired right to a huge transformer and use relays to connect the phone straight to them (90v AC if I remember?) to ring the phone.
I'm using a Vonage V-Portal, but not the newer one's that don't have LCD's, this is the one with the built in Caller ID. I used to use this phone on this VoIP box for years before putting the phone away. It's only after the phone was in storage did it start having these problems.
I'll need to re-examine the switch hook and see if I can see any issue, perhaps it needs more cleaning than alcohol and deoxit.
I could test the capacitor if needed, but neither does the schematic, nor does the cap itself, say what the value is.
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