Hy there,

now i will see if here someone can help me. The Mexican N9 have a crapple FW. For the Provider SIP, Skype, Youtube and Google are didnt installed.
For change the number 420 in 001 in sources list you can install these stuff manually with
apt-get -y install account* l10n-app*
Everything is fine. My Sip-Account connect but i didnt have Audio.
My Sip-Server is telling me

Internettelefonie with 621@IP:14236;transport=udp over IP:14236;transport=udp didnt was succesfull. Error: (408)

I'am thinking maybe SIP-Installation isn´t complete? Some package is still absence?
With my old Nokia E71 all is fine and works great

Ok. Seems, change from stun.sipgate.de:10000 to stun1und1.de:3478 solved the Problem. Now it is working great Fritz!Box 7270v2 Sip-Registrar with N9 Sip-Client.