Siri giving out incorrect info

Believe it or not, this is often a minor activation issue–assuming the iPhone is on Sprint or Verizon. On Verizon, Dial *228 from the Phone app. On Sprint, dial ##UPDATE# (##873283#). Follow the voice prompts, if any. The process takes a minute or two. After you get a pop-up message indicating the update was successful, wait another minute. You should see your service indicator go away for a moment then come back.

Afterward, try Siri again. This will likely resolve your text message issues too, though a restart of the iPhone (hold sleep/wake button, swipe to shut off, wait, start back up) may be necessary there.

Since Apple doesn't offer an API to use their Siri services, you might be limited to coming up with some Rube Goldberg machine that presses the home button of your iPhone and rubs a buddha belly for luck (or whatever else you desire to have happen simultaneously with the incoming call) so that Siri will work at the exact moment your caller is speaking to her.

Again, there is no API to do anything except listen to what Siri responds sonically so it's not clear how this might be useful for anything but a fun youtube video.

Now, your business might very well be able to license a voice like Siri (or the same exact voice for enough $$) by contacting Nuance or some other computer speech vendor - but their product likely won't run on iOS since other custom hardware is likely to be more capable for an automated PBX.