I just ran into this one, too. Same provider, same symptoms, newest linphone from unstable.
Did anyone who knows a little more about SIP than I do try to protocol-trace what actually happens, here? Is GMX speaking broken SIP, or is this a real linphone bug? If it's the first, could linphone be "fixed", anyway? -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
