Really it is miserable.
I bring 8 Digium Phone D40 and I used them with a customer, the voice quality is bad internally (between the extension), there is no clearance at all ! We are hearing the voice like another person.
The used codec is ulaw.
The firmware version is: 1_1_0_0_48178
Even at the web based configuration at the phone it self, I am not able to do reboot (there is no reboot button) and I can do this only from the Phone it self.
From the speaker, the voice is very bad and weak.
I am really feel disappointed why I did not use Polycom.
Can someone help me or advise me what to do in this?