Hi I have the same problem (but have had it sporadically with using SIP / Sipgate / GV before I had the obitalk too)
ie dialing into conference calls, etc
Once I hooked up the obitalk110, I tried to dial into the secondary google voice account configured, to muck around with the voicemail features-in GV's ivr menu, but Google Voice wouldn't recognize my PIN.
I have decent Panasonic cordless phones kx-tga939t
When I press and hold the buttons on the handset, the dtmf tone stays on as long as I press the button.
But when I listen on the other end (via a cellphone or something), it's only a short dtmf tone, no matter how long I hold down the panasonic buttons
So it seems that my cordless phone does really have press-and-hold-dtmf tones
1. Does anyone know of a dect cordless sys that has press and hold
2. Is there gain or other settings to increase the dtmf tones on the receiving end?
Note I've only configed the obitalk thru the web portal and not directly via web admin, I read they can conflict
Also I do not have a landline to test and the phone is hooked up correctly
Thanks
G