Was gonna say the same thing. 600 to 1.2K will work just fine. I believe the old 400E 1A2 cards use 600 ohms for the hold bridge.
I want to automatically answer a ringing phone, then automatically disconnect.
Read some of the threads here by people who wanted to know why they have a ring-trip situation and you will find that it's because they used a protector with a low clamping voltage (lower than the 90V ring). A 75V protector on the line will do what you want all by itself. Ring/click/disconnect.
-Hal
