I tried the Cart Recovery demo, pretty slick! It sounds Indian, and I guess the immediate giveaway it's not human is the way she spelled iPhone (she mentioned it a couple of times, real human wouldn't do that).

Not sure how the voice compares with "generic" solution e.g. from Google. Can those generic solutions sound like a "local"? E.g. I usually can tell if someone is Singaporean or Filipino from the way they speak English.