If there is anybody who happens to read this who is responsible for implementing the code that reads the meeting codes, please implement the following changes:
1. Make it so meeting codes are strictly forbidden from having repeating digits, by construction.
2. Make it so that when entering meeting codes, if you think you see repeated digits, consider it just one instance of that digit.
The cell system does not use literal DMTF tones to dial calls; those are played by the phone itself for the user's benefit. If the cell system used DMTF for numeric signalling, we'd all be dialing a lot more wrong numbers. (And we'd all groan when we got a new line with a number with repeated digits in it....) Heck, even on VOIP systems very well connected to the internet, I've had trouble entering 9-12 digit codes without the remote system becoming convinced I'd actually entered a 11-15 digit code. I've gotten a few strange looks before for the way I push the buttons for the codes as rapidly as possible, because, ironically, the human intuition here is exactly backwards; you intuitively think that if the remote system isn't understanding your numbers you should press the number "longer" and harder, but that actually increases the chances of the system hearing multiple instances of that number. You actually want to pound the number buttons as quickly as possible. You still can't deal with the entire number being dropped, but it's still your best chance sometimes.
....
'course, there's probably some patent out that this is in violation of. In which case you are authorized and even encouraged to use this post as part of a defense that this technique is Obvious to One Skilled in the Art. I'm not a telecom engineer.