We are planning some upgrades over the next few days that should improve some DTMF handling on our VoIP platform. Please do let us know if you have any issues.
The upgrade to our voice servers will be later tonight (Tuesday). We have also added an option on some of our number ranges to allow RFC2833 or in-band DTMF, on our control pages. - this is only on a few of our ranges and some ported numbers. Outgoing DTMF, which mostly worked, should now be greatly improved. Please let us have any feedback.