This describes how to configure the SIP account on Maemo (on Nokia N900) to work with 1&1.

• Create a new SIP Account

Username: {Your1und1PhoneNumber}@sip.1und1.de (add the "international area code" to your number but without the "+")

Password: {YourVoIPPassword}

 

• Advanced SIP settings

"Use for telephone numbers" Selected

"User name" Leave blank

"Transport" Auto (or UDP) works both

"Outbound proxy" Leave blank

"Port" 5060

"Discover public address" Selected

"Loose routing" NOT selected

"Keep-alive mechanism" Auto

"Keep-alive period" Auto

"Autodetect STUN" Auto (or stun.1und1.de)

 

• Here are some additional information:

realm: 1und1.de

STUN-Server: stun.1und1.de

Sip-Server: sip.1und1.de

Ports (UDP): 5070 - 5079 and 30000-30019