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Changing iPhone DTMF Tones to Work with Some IVRs iOS devices
Some IVRs have difficulty recognizing the long DTMF tones from iPhone. Although not a permanent solution, you can force iPhone to use short DTMF tones when needed. I have not seen this documented here and it has helped me with interaction between my iPhone and my GE Simon alarm.

On iPhone, go to Settings » General » Network and set 'Enable 3G' to 'OFF.' iPhone will now send short DTMF tones. You should re-enable 3G after use so that you don't stay on Edge service if you don't have to.

[crarko adds: I haven't tested this one. I'm not a phone person so I had to look up the acronyms. IVR is the recognition technology that allows voice activated dialing and other kinds of verbal commands. DTMF is basically sound modulation to use tones to transmit data, like phone numbers, improving on the old pulse dialing systems and the telegraph. OK, so I'm a bit old-fashioned.]
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Changing iPhone DTMF Tones to Work with Some IVRs | 7 comments | Create New Account
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Not sure if this is legit
Authored by: lullabud on Mar 01, '11 10:45:24AM

I just tested my iPhone on both 3G and E and they both had the same length and amplitude DTMF tones, which makes sense. There's no reason to have those differ just because you're on a different radio technology.

I tested on an unmodified 4G iPhone v4.2.1



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Not sure if this is legit
Authored by: fbitterlich on Mar 11, '11 05:16:15AM

Same test results on a 3GS w/ 4.2.1. No difference in tone length.

I would have been really surprised if 3G or not makes any difference in the length of the DTMF tones generated. That really has nothing to do with it.



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Changing iPhone DTMF Tones to Work with Some IVRs
Authored by: AriX on Mar 01, '11 04:32:13PM

IVR is not voice recognition, as crarko suggests. It's just the opposite. An IVR is basically when you call and it says "press 1 for this, press 2 for that, etc.". So the technology here is that the IVR is recognizing the DTMF tones (the different beeps you hear when you press different digits) so that it knows what button you pressed, not that it is "allowing verbal commands" or anything.



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Changing iPhone DTMF Tones to Work with Some IVRs
Authored by: fbitterlich on Mar 11, '11 05:20:57AM

Actually, it is both - voice and DTMF recognition.


http://en.wikipedia.org/wiki/IVR



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Changing iPhone DTMF Tones to Work with Some IVRs
Authored by: AriX on Mar 11, '11 05:27:13AM

Fair enough! However, in this instance, we are explicitly referring to the DTMF tones.



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Changing iPhone DTMF Tones to Work with Some IVRs
Authored by: edzworld on Mar 02, '11 08:44:13AM

As stated, this works for those times when an IVR does not respond properly or at all - some IVR services like conference call lines work fine others don't. @ lull, should have mentioned this works on iPhone 3GS with 4.2.1 - could be Apple fixed this in newer hardware.



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Changing iPhone DTMF Tones to Work with Some IVRs
Authored by: deebpickus on Mar 15, '11 01:12:19PM

We are having the same problem when someone calls into our Panasonic phone system and tries to be transferred to an extension. At first I thought that it was only when someone called in when using an iPhone and AT&T M-Cell because we have to have those here and cannot call into our office from our iPhones. Then our owner called in from his home, but he also has an M-cell. But just today one of our salespeople called in and said he could not enter in an extension.

I then tested it by calling in with Skype and was able to enter the extension and get through.

Then I tried calling in with the iPhone Phone app and using the Skype dialer for the tones and that did not work (it heard the tones, they just were too long).

It could be AT&T's service that is causing the long DTMF tones. I know that the tones sound longer on the other end than they do from the iPhone because I can tap in and listen to the dialing when someone calls and enters an extension. So I dialed in from my iPhone and I could hear the tones when I pressed them on the phone and what they sounded like through the system. The tones thru the system were much longer than what I heard from the iPhone.

So someone along the way is lengthening the tones. I'm guessing it is AT&T and not the iPHone. But that is just a guess.



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