I recently switched my home phone service to AT&T CallVantage VoIP. Mostly we are very happy with the results.
One problem, which I was sort expecting we might encounter is using Touch Tones. When I attempt to access my voicemail at my office from home, or use other Touch Tones controlled services, it is very unreliable.
I have tried several phones including a basic desk phone that allows long tones that generate as long as you press the button, and phones that generate a fixed length tone.
Anyone have any idea how the VoIP industry is going to address this issue?