I've had a Cisco IP phone on my desk for a month or so, it's configured with a Draytel login and been working fine. I updated the firmware on my 2820 to 3.3.4.1_232201 this morning and subsequently the Cisco SPA504G will only logon to Draytel for a minute, and I can't get it to reconnect. The only way I can get the phone to reconnect to Draytel now is rebooting the router, and then within a minute or two the phone seems to lose visibility of Draytel and reports "Registration Failed No Response".

Presumably there is something set in the new firmware / config thats causing this, anyone able to give me a clue please?

Never mind, I found that I'm not alone with this disconnect feature and all is fine now I've downgraded my firmware to 3.3.3_232201. Might be an idea for someone to put this SIP issue in the notes for the latest firmware, some of us do read them and it would have saved me wasting 1/2 a day upgrading / downgrading / nuking config etc. Good work Draytek.

Me too! Any additional info from Draytek would be very welcome