Also keep in mind (as I am finding out more and more) that the X100P and its clones is a fairly primitive device with very few adjustments. It is also made to US impedance specs and thus the sound quality here in Europe leaves lots to be desired.
The X100P that answers and transfers withing two rings is locate at work, connected to an analog port to one of our PBX. I also have another at home which I plugged in to a Vonage ATA; that one answers in one ring? but didn’t get to work (the phone rings with incoming calls but when you answer the phone, the line keeps ringing - for outgoing calls, I couldn’t get it to dial at all.
By the way, the X100P clone at Work, works fine as long as calls are inside the PBX. If I make calls outside the office I get varied results: sometimes a little echo, sometimes noises on the line.
No biggie, at work we plan to get the either a couple of T1 or Quad T1 Digium cards to use with 2 spare T1s we have - If we can get asterisk to do what we need it to do, that is. At this point we are just testing the waters.