IPO VPN Phones - Unable to dial after making a call

[beauuu]

I have several VPN phones configured and working but it seems to be dropping the VPN connection or something of the likes after initially establishing a call. Once I've placed a call, I can hear everyone fine and talk to them as well, however if I'm calling into say a G2M conference line and need to enter the digits for the meeting code, it does not recognize my input. I am also unable to hang up and end the call.. Once I hang up it shows that the call is still open before it eventually seems to crash and reboot the phone.

Any ideas? If I need to provide my current configuration, let me know.

Thanks!