[VoIP] Asterisk and Payphones

[Mark Rudholm]

Steph Kerman wrote:
> Actually... it would not care.  All single coil coin relays short 
> circuit their own winding upon operation, replacing the load towards the 
> CO with that 1K resistor you see mounted on the contacts.  The shorted 
> coil keeps the relay operated for ~450 mS regardless of the duration of 
> the applied voltage.  The trigger contacts open during armature 
> operation, disconnecting the coil and/or resistor from the line when the 
> armature restores at the end of 450 mS.  
> 
> This however is NOT true for double coil coin relays used in earlier 
> 3-slot sets.  They remain operated for the duration of the applied 
> voltage and open the trigger contact when voltage is removed.

Ah, very good to know.  It sounds like I really need to get
my hands on the relevant BSPs before I move forward on this.