This is an old revision of the document!
2018: MyExtensions → click the key icon next to your SIP number and take the credentials from the tooltip
Server: voip.eventphone.de Authentication Realm: voip.eventphone.de Username: Your SIP number
Password: look it up in the GenericUserRegistrationUtility (Guru)
(Menu→Edit Numbers→edit icon of your VoIP number)^
Hint: Extensions are being installed automatically every few minutes during the event. Please wait a few minutes after creating your SIP extension.
All DECT-phones and other extensions are reachable via sip:XXXX@voip.eventphone.de
just dial: <area prefix without leading zero><number> for example: to call the BVG (national style) dial 0 30 19449
to place a national call you may also dial: 0 <area prefix with leading zero><number> for example: to call the BVG (local style) dial 0 030 19449 (just like in the good old PBXs )
Further information can be found here: wikipedia:Eventphone
For a list of SIP Software Clients, please refer to http://www.voip-info.org/wiki/view/Open+Source+VOIP+Software