Okay, I just tried doing some (simulated) pulse dialing.
My phone is a Lucent model 100 (described in the two posts immediately above), and my phone company is AT&T, and my phone account with them is U-Verse which is AT&T’s own private protocol.
This phone line seems to NOT support pulse dialing. When I try it, after each digit I dial I just get a dial tone again. Like it’s ignoring it. But this is U-Verse. It doesn’t even get DSL. Instead it has its own DSL-like service, requiring their own kind of modem/router/hub box, which does Wi-Fi too.
The phone itself does seem to support pulse dialing type-ahead, which I find a bit surprising. I tried as many as three higher digits (7, 8, 9) is rapid order, and it pulsed them in sequence one at a time. Who’da thunk it?