[Asterisk-Users] Inband DTMF is not supported on codec G.711 u-law. Use RFC2833

[asterisk at bortal.de]

Hello!

I can connect to asterisk with kphone (sip) with no problem.
This is my extentions.conf

[kphone]
exten => 123,1,Answer()
exten => 123,2,Playback(vm-goodbye)
exten => 123,3,Hangup()

So when i call "123" i expect to hear the Playback sound.
However, when i dial "123" i get this at the astersisk output:


Inband DTMF is not supported on codec G.711 u-law. Use RFC2833
Inband DTMF is not supported on codec G.711 u-law. Use RFC2833
Inband DTMF is not supported on codec G.711 u-law. Use RFC2833
Inband DTMF is not supported on codec G.711 u-law. Use RFC2833
Inband DTMF is not supported on codec G.711 u-law. Use RFC2833
Inband DTMF is not supported on codec G.711 u-law. Use RFC2833


What am i doing wrong? Am i missing a codec somewhere?

Thanks, Mario