Have exactly same problem. Used Dual 3088 for more than a year successfully on Skype. Last week developed connection OK/no sound problem you describe. Hopeless dealing with Skype technical support ..."We are sorry to say but you will not be able to downgrade your Skype version on your Dualphone. We are aware of this problem and are working hard on fixing it as soon as possible. We apologize for the inconvenience that this may cause." My Dualphone 3088 is running the latest firmware 0250 27/08/09* Rel 8.
The following post describes the same problem last Dec.
I've asked paolobianca1978 how can I download the Skype Version 184.108.40.206? How do I install that downgrade on the phone?
Just worked it out. Downloaded Dualphone 3088 Manual (.pdf) Instructions on how to select previous firmware download - current ver 250, selected 245. Took about 10-15 min to download. The phone HAS NEVER BEEN BETTER. No echo, much louder clearer audio - it's like a new phone - brilliant.
I have no connection in my phone at all (also tried with different router etc) and therefore get a message "no connection to update server" when I press "firmware update".
I assume that is what you meant? I checked the pdf:http://dualphone.net/User_manual-795.aspx but connot find any other way to downgrade the firmware. Is it possible to downgrade without having a connection in the phone? Reset does not help.
Also, some of you post were very confusing. But thanks for trying!
I started experiencing the same issue yesterday. My phone says "Connecting", and yesterday retrieving a new IP address and reseting the base station briefly restored a connection, but as soon as I tried to access a voicemail, it dropped out again.
I've not been able to get it to connect at all today, and I'm also finding that I can't return to an older firmware version as I can't connect to the update server at all.
make a video showing where my phone does not log
this step to downgrade your firmware to 2.45