I noticed this bug after becoming frustrated with Empathy in Ubuntu Lucid. Empathy is indeed doing DMTF through the dial pad properly, so this is technically not-a-bug, but the user interface is unlike most other VOIP software:
* Empathy buries the keypad under Sidebar -> Audio Input -> Dialpad, whereas most applications show the dialpad by default or have a large button for it.
* Empathy doesn't echo DMTF, which is unlike regular telephone hardware, which makes the user think that Empathy is not sending the tone.
I noticed this bug after becoming frustrated with Empathy in Ubuntu Lucid. Empathy is indeed doing DMTF through the dial pad properly, so this is technically not-a-bug, but the user interface is unlike most other VOIP software:
* Empathy buries the keypad under Sidebar -> Audio Input -> Dialpad, whereas most applications show the dialpad by default or have a large button for it.
* Empathy doesn't echo DMTF, which is unlike regular telephone hardware, which makes the user think that Empathy is not sending the tone.